ASP中如何控制图片大小，（如何实现等比缩放）？高手帮忙啊

 1<script language="JavaScript">   
 2<!--   
 3var flag=false;   
 4function DrawImage(ImgD){   
 5var image=new Image();   
 6image.src=ImgD.src;   
 7if(image.width>0 && image.height>0){   
 8flag=true;   
 9if(image.width/image.height>= 164/112){   
10if(image.width>164){   
11ImgD.width=164;   
12ImgD.height=(image.height*164)/image.width;   
13}else{   
14ImgD.width=image.width;   
15ImgD.height=image.height;   
16}   
17ImgD.alt=image.width+"×"+image.height;   
18}   
19else{   
20if(image.height>112){   
21ImgD.height=112;   
22ImgD.width=(image.width*112)/image.height;   
23}else{   
24ImgD.width=image.width;   
25ImgD.height=image.height;   
26}   
27ImgD.alt=image.width+"×"+image.height;   
28}   
29}   
30}   
31//-->   
32</script>

1<a ```"="" href="```
2=trim(rs(" picurl"))="" target="_blank"><img ```"="" border="0" height="112" imgurl"))="" onload="javascript:DrawImage(this);" src="```
3=trim(rs(" width="164"/></a>