<!--   
//图片按比例缩放   
var flag=false;   
function DrawImage(ImgD,ItemWidth,Itemheight){   
var image=new Image();   
var iwidth = ItemWidth; //定义允许图片宽度   
var iheight = Itemheight; //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;   
}   
}   
}    
//调用：<img src="图片" onload="javascript:DrawImage(this,w,h)">   
//-->   
