function disp(ImgD)
{ var image=new Image(); 
  var iwidth = 160;  //定义允许图片宽度 
  var iheight = 160;  //定义允许图片高度 
  image.src=ImgD.src;
  //图片存在 
  if(image.width>0 && image.height>0)
  { flag=true; 
    if(image.width/image.height>=iwidth/iheight)
	  {if(image.width>iwidth)
	     {ImgD.width=iwidth; 
          ImgD.height=(image.height*iwidth)/image.width; 
          }
	   else
	     {ImgD.width=image.width;   
          ImgD.height=image.height; 
          } 
	   //ImgD.style.display="block";
       } 
    else
	  {if(image.height>iheight)
	     {ImgD.height=iheight; 
          ImgD.width=(image.width*iheight)/image.height;      
          }
	   else
	     {ImgD.width=image.width;   
          ImgD.height=image.height; 
          } 
	   //ImgD.style.display="block";
       } 
     }   
 }