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