function a(i){
      
      if(i==1)
      {
           document.getElementById("imgBig").src=document.getElementById("img1").src;
      }
       if(i==2)
      {
           document.getElementById("imgBig").src=document.getElementById("img2").src;
      }
      if(i==3)
      {
           document.getElementById("imgBig").src=document.getElementById("img3").src;
      }
      if(i==4)
      {
           document.getElementById("imgBig").src=document.getElementById("img4").src;
      }
      if(i==5)
      {
           document.getElementById("imgBig").src=document.getElementById("img5").src;
      }

      

	}
//	function b(i){
//		switch(i){
//			case 1:
//			document.getElementById("jst").style.display="block";
//			document.getElementById("jst1").style.display="none";
//			document.getElementById("jst2").style.display="none";
//			document.getElementById("jst3").style.display="none";
//			document.getElementById("jst4").style.display="none";
//			break;
//			case 2:
//			document.getElementById("jst").style.display="none";
//			document.getElementById("jst1").style.display="block";
//			document.getElementById("jst2").style.display="none";
//			document.getElementById("jst3").style.display="none";
//			document.getElementById("jst4").style.display="none";
//			break;
//			case 3:
//			document.getElementById("jst").style.display="none";
//			document.getElementById("jst1").style.display="none";
//			document.getElementById("jst2").style.display="block";
//			document.getElementById("jst3").style.display="none";
//			document.getElementById("jst4").style.display="none";
//			break;
//			case 4:
//			document.getElementById("jst").style.display="none";
//			document.getElementById("jst1").style.display="none";
//			document.getElementById("jst2").style.display="none";
//			document.getElementById("jst3").style.display="block";
//			document.getElementById("jst4").style.display="none";
//			break;
//			case 5:
//			document.getElementById("jst").style.display="none";
//			document.getElementById("jst1").style.display="none";
//			document.getElementById("jst2").style.display="none";
//			document.getElementById("jst3").style.display="none";
//			document.getElementById("jst4").style.display="block";
//			break;
//		}
//	}
function t(i){
		p(i);
	}
	function p(i){
		switch(i){
			case 1:
			document.getElementById("jstt").style.display="block";
			document.getElementById("jstt1").style.display="none";
			document.getElementById("jstt2").style.display="none";
//			document.getElementById("jstt3").style.display="none";
			break;
			case 2:
			document.getElementById("jstt").style.display="none";
			document.getElementById("jstt1").style.display="block";
			document.getElementById("jstt2").style.display="none";
//			document.getElementById("jstt3").style.display="none";
			break;
			case 3:
			document.getElementById("jstt").style.display="none";
			document.getElementById("jstt1").style.display="none";
			document.getElementById("jstt2").style.display="block";
//			document.getElementById("jstt3").style.display="none";
			break;
//			case 4:
//			document.getElementById("jstt").style.display="none";
//			document.getElementById("jstt1").style.display="none";
//			document.getElementById("jstt2").style.display="none";
//			document.getElementById("jstt3").style.display="block";
//			break;
		}
	}

<!-- 
// 说明：用 JavaScript 实现网页图片等比例缩放 
function DrawImage(ImgD,FitWidth,FitHeight) 
{ 
var image=new Image(); 
image.src=ImgD.src; 
if(image.width>0 && image.height>0) 
{ 
if(image.width/image.height>= FitWidth/FitHeight) 
{ 
if(image.width>FitWidth) 
{ 
ImgD.width=FitWidth; 
ImgD.height=(image.height*FitWidth)/image.width; 
} 
else 
{ 
ImgD.width=image.width; 
ImgD.height=image.height; 
} 
} 
else 
{ 
if(image.height>FitHeight) 
{ 
ImgD.height=FitHeight; 
ImgD.width=(image.width*FitHeight)/image.height; 
} 
else 
{ 
ImgD.width=image.width; 
ImgD.height=image.height; 
} 
} 
} 
} 
//--> 

function ulShow(i)
{
    if(i==1)
    {
        
        
        if(document.getElementById("ulProduct1").style.display == "block")
        {
            document.getElementById("ulProduct1").style.display = "none";
            document.getElementById("span1").style.display = "none";
        }
        else
        {
          document.getElementById("ulProduct1").style.display = "block";
          document.getElementById("span1").style.display = "block";
          document.getElementById("product").value=1;
          
//          document.location.href='ProductCategoryList.aspx?productCategoryId=4';
          
          document.getElementById("span2").style.display = "none";
          document.getElementById("span3").style.display = "none";
         
        }
    }
     if(i==2)
    {
        if(document.getElementById("ulProduct2").style.display == "block")
        {
            document.getElementById("ulProduct2").style.display = "none";
            document.getElementById("span2").style.display = "none";
        }
        else
        {
          document.getElementById("ulProduct2").style.display = "block";
          document.getElementById("span2").style.display = "block";
          document.getElementById("product").value=2;
          
//          document.location.href='ProductCategoryList.aspx?productCategoryId=5';
         
         
          document.getElementById("span1").style.display = "none";
          document.getElementById("span3").style.display = "none";
        }
       
	}
     if(i==3)
    {
         if(document.getElementById("ulProduct3").style.display == "block")
        {
            document.getElementById("ulProduct3").style.display = "none";
            document.getElementById("span3").style.display = "none";
        }
        else
        {
          document.getElementById("ulProduct3").style.display = "block";
          document.getElementById("span3").style.display = "block";
          
         document.location.href='ProductCategoryList.aspx?productCategoryId=1';
          
          document.getElementById("span1").style.display = "none";
          document.getElementById("span2").style.display = "none";
        }
    }
}

function ulShowOne(i)
{
    if(i==1)
    {
        
        
        if( document.getElementById("span1").style.display == "block")
        {
//            document.getElementById("ulProduct1").style.display = "none";
            document.getElementById("span1").style.display = "none";
        }
        else
        {
//          document.getElementById("ulProduct1").style.display = "block";
          document.getElementById("span1").style.display = "block";
          
          document.location.href='pinpai.aspx';
          document.getElementById("span2").style.display = "none";
          document.getElementById("span3").style.display = "none";
          document.getElementById("span4").style.display = "none";
          document.getElementById("span5").style.display = "none";
        }
    }
     if(i==2)
    {
        if(document.getElementById("span2").style.display == "block")
        {
           
            document.getElementById("span2").style.display = "none";
        }
        else
        {
        
          document.getElementById("span2").style.display = "block";
          document.location.href='ZiZhi.aspx';
          
          
           document.getElementById("span1").style.display = "none";
          document.getElementById("span3").style.display = "none";
          document.getElementById("span4").style.display = "none";
           document.getElementById("span5").style.display = "none";
         
        }
       
    }
     if(i==3)
    {
         if(document.getElementById("span3").style.display == "block")
        {
           
            document.getElementById("span3").style.display = "none";
        }
        else
        {
         
          document.getElementById("span3").style.display = "block";
            document.location.href='YingXiang.aspx';
            
          document.getElementById("span1").style.display = "none";
          document.getElementById("span2").style.display = "none";
          document.getElementById("span4").style.display = "none";
           document.getElementById("span5").style.display = "none";
        }
    }
     if(i==4)
    {
         if(document.getElementById("span4").style.display == "block")
        {
           
            document.getElementById("span4").style.display = "none";
        }
        else
        {
         
          document.getElementById("span4").style.display = "block";
            document.location.href='WenTi.aspx';
            
          document.getElementById("span1").style.display = "none";
          document.getElementById("span2").style.display = "none";
          document.getElementById("span3").style.display = "none";
           document.getElementById("span5").style.display = "none";
        }
    }
    if(i==5)
    {
         if(document.getElementById("span5").style.display == "block")
        {
           
            document.getElementById("span5").style.display = "none";
        }
        else
        {
         
          document.getElementById("span5").style.display = "block";
            document.location.href='SheHui.aspx';
            
          document.getElementById("span1").style.display = "none";
          document.getElementById("span2").style.display = "none";
          document.getElementById("span3").style.display = "none";
          document.getElementById("span4").style.display = "none";
        }
    }
}
function ulShowTwo(i)
{
    if(i==1)
    {
        
        
        if(document.getElementById("span1").style.display == "block")
        {
           
            document.getElementById("span1").style.display = "none";
        }
        else
        {
         
          document.getElementById("span1").style.display = "block";
          document.location.href='ZhiNan.aspx';
          
          document.getElementById("span2").style.display = "none";
          document.getElementById("span3").style.display = "none";
          document.getElementById("span4").style.display = "none";
         
        }
    }
     if(i==2)
    {
        if(document.getElementById("span2").style.display == "block")
        {
           
            document.getElementById("span2").style.display = "none";
        }
        else
        {
        
          document.getElementById("span2").style.display = "block";
            document.location.href='LiuCheng.aspx';
          
          
           document.getElementById("span1").style.display = "none";
          document.getElementById("span3").style.display = "none";
          document.getElementById("span4").style.display = "none";
        
         
        }
       
    }
     if(i==3)
    {
         if(document.getElementById("span3").style.display == "block")
        {
           
            document.getElementById("span3").style.display = "none";
        }
        else
        {
         
          document.getElementById("span3").style.display = "block";
            document.location.href='FangAn.aspx';
            
            
          document.getElementById("span1").style.display = "none";
          document.getElementById("span2").style.display = "none";
          document.getElementById("span4").style.display = "none";
           
        }
    }
     if(i==4)
    {
         if(document.getElementById("span4").style.display == "block")
        {
           
            document.getElementById("span4").style.display = "none";
        }
        else
        {
         
          document.getElementById("span4").style.display = "block";
            document.location.href='JiaMeng.aspx';
           
            
          document.getElementById("span1").style.display = "none";
          document.getElementById("span2").style.display = "none";
          document.getElementById("span3").style.display = "none";
           
        }
    }
   
}
function ulShowThree(i)
{
    if(i==1)
    {
        
        
        if(document.getElementById("span1").style.display == "block")
        {
           
            document.getElementById("span1").style.display = "none";
        }
        else
        {
         
          document.getElementById("span1").style.display = "block";
          document.location.href='NewsList.aspx?id=3';
          
          document.getElementById("span2").style.display = "none";
          document.getElementById("span3").style.display = "none";
          document.getElementById("span4").style.display = "none";
         
        }
    }
     if(i==2)
    {
        if(document.getElementById("span2").style.display == "block")
        {
           
            document.getElementById("span2").style.display = "none";
        }
        else
        {
        
          document.getElementById("span2").style.display = "block";
            document.location.href='NewsList.aspx?id=2';
          
          
           document.getElementById("span1").style.display = "none";
          document.getElementById("span3").style.display = "none";
          document.getElementById("span4").style.display = "none";
        
         
        }
       
    }
     if(i==3)
    {
         if(document.getElementById("span3").style.display == "block")
        {
           
            document.getElementById("span3").style.display = "none";
        }
        else
        {
         
          document.getElementById("span3").style.display = "block";
            document.location.href='NewsList.aspx?id=1';
            
            
          document.getElementById("span1").style.display = "none";
          document.getElementById("span2").style.display = "none";
          document.getElementById("span4").style.display = "none";
           
        }
    }
     if(i==4)
    {
         if(document.getElementById("span4").style.display == "block")
        {
           
            document.getElementById("span4").style.display = "none";
        }
        else
        {
         
          document.getElementById("span4").style.display = "block";
            document.location.href='NewsList.aspx?id=4';
           
            
          document.getElementById("span1").style.display = "none";
          document.getElementById("span2").style.display = "none";
          document.getElementById("span3").style.display = "none";
           
        }
    }
   
}
function ulShowMessageTwo(i)
{
    if(i==1)
    {
        
        
        if(document.getElementById("span1").style.display == "block")
        {
           
            document.getElementById("span1").style.display = "none";
        }
        else
        {
         
          document.getElementById("span1").style.display = "block";
          document.location.href='MessageAdd.aspx';
          
          document.getElementById("span2").style.display = "none";
       
         
         
        }
    }
     if(i==2)
    {
        if(document.getElementById("span2").style.display == "block")
        {
           
            document.getElementById("span2").style.display = "none";
        }
        else
        {
        
          document.getElementById("span2").style.display = "block";
            document.location.href='ReplyList.aspx';
          
          
           document.getElementById("span1").style.display = "none";
       
         
        
         
        }
       
    }
    if(i==3)
    {
        if(document.getElementById("span3").style.display == "block")
        {
           
            document.getElementById("span3").style.display = "none";
        }
        else
        {
        
          document.getElementById("span3").style.display = "block";
            document.location.href='Kefu.aspx';
          
          
           document.getElementById("span1").style.display = "none";
           document.getElementById("span2").style.display = "none";
       
         
        
         
        }
       
    }
     
    
   
}

<!-- 
// 说明：用 JavaScript 实现网页图片等比例缩放 
function DrawImage(ImgD,FitWidth,FitHeight) 
{ 
var image=new Image(); 
image.src=ImgD.src; 
if(image.width>0 && image.height>0) 
{ 
if(image.width/image.height>= FitWidth/FitHeight) 
{ 
if(image.width>FitWidth) 
{ 
ImgD.width=FitWidth; 
ImgD.height=(image.height*FitWidth)/image.width; 
} 
else 
{ 
ImgD.width=image.width; 
ImgD.height=image.height; 
} 
} 
else 
{ 
if(image.height>FitHeight) 
{ 
ImgD.height=FitHeight; 
ImgD.width=(image.width*FitHeight)/image.height; 
} 
else 
{ 
ImgD.width=image.width; 
ImgD.height=image.height; 
} 
} 
} 
} 
//-->