// JavaScript Document
<!--
//图片按比例缩放
var flag=false;
 
function DrawImage(ImgD,twidth,theight){ 
 var image=new Image();
 var iwidth = twidth-2;  //定义允许图片宽度
 var iheight = theight-2; //定义允许图片高度
 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;
      }
  }
} 

//-->