// ͼƬµÈ±ÈÀýËõ·Å
function DrawImage(imgname,widths,heights){ 
var w; 
var h; 
//window.alert(picimg.width); 
//window.alert(picimg.height); 
w=imgname.width; 
h=imgname.height; 
if(imgname.width>widths){ 
do 
w=w-1; 
while (w>widths) ; 

s=w/imgname.width; 
//window.alert(s); 
imgname.width=w; 
imgname.height=h*s; 
h=imgname.height 
} 
//window.alert(imgname.height); 
//window.alert(heights); 
if(imgname.height>heights){ 
do 
h=h-1; 
while (h>heights) ; 

s=h/imgname.height; 
//window.alert(s); 
imgname.width=w*s; 
imgname.height=heights; 
} 
}