// JavaScript Document
// DrawImage(this, ¿í, ¸ß)
// <img src="img.gif" onload="javascript:DrawImage(this,160,180);"  >
function DrawImage(ImgD,maxwidth,maxheight){  
   var flag=false;   //¿ØÖÆСͼ
   var image=new Image(); 
   image.src=ImgD.src;  
   if(image.width>0 && image.height>0){  
    flag=true;  
    if(image.width/image.height>=maxwidth/maxheight){  
		 if(image.width>maxwidth){    
			 ImgD.width=maxwidth;  
			 ImgD.height=(image.height*maxwidth)/image.width;  
		 }else{  
			 ImgD.width=image.width;    
			 ImgD.height=image.height;  
		 }  
     }  
    else{  
		 if(image.height>maxheight){    
			 ImgD.height=maxheight;  
			 ImgD.width=(image.width*maxheight)/image.height;       
		 }else{  
			 ImgD.width=image.width;    
			 ImgD.height=image.height;  
		 }  
     }  
    }  
}