var flag=false; 
var w;
w=160;
var h;
h=160;
function DrawImage(ImgD){ 
   var image=new Image(); 
   image.src=ImgD.src; 
   if(image.width>0 && image.height>0){ 
    flag=true; 
    if(image.width/image.height>= w/h){ 
     if(image.width>w){   
     ImgD.width=w; 
     ImgD.height=(image.height*w)/image.width; 
     }else{ 
     ImgD.width=image.width;   
     ImgD.height=image.height; 
     } 
     } 
    else{ 
     if(image.height>h){   
     ImgD.height=h; 
     ImgD.width=(image.width*h)/image.height;     
     }else{ 
     ImgD.width=image.width;   
     ImgD.height=image.height; 
     } 
     } 
    } 
}