<!--
//图片按比例缩放 
var flag=false;
function DrawImage(ImgD,iwidth,iheight)
{
   //参数(图片,允许的宽度,允许的高度)
   var image=new Image();
   image.src=ImgD.src;
   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.alt=image.width+"×"+image.height;
       }
   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.alt=image.width+"×"+image.height;
       }
   }
   }