图片等比例缩小

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<script type="text/javascript">
<!--
var flag=false;
图片等比例缩小:

function DrawImage(ImgD){
var image=new Image();
var iwidth = 999;
var iheight = 21; //定义允许高度，当宽度大于这个值时等比例缩小
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;
}
}else{
if(image.height>iheight){
ImgD.height=iheight;
ImgD.width=(image.width*iheight)/image.height;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
}
}
}
//调用：<img src="图片" onload="javascript:DrawImage(this)">
//-->
</script>

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