// JScript 文件

 
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){ 

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; 
} 

} 
else{ 
if(image.height>iheight){ 
ImgD.height=iheight; 
ImgD.width=(image.width*iheight)/image.height; 
}else{ 
ImgD.width=image.width; 
ImgD.height=image.height; 
} 

} 
} 
}