//============================================================================
//ͼƭ��с�ȱ�������
var flag=false;
function drawimage(imgd,imwidth,imheight){
	var image=new image();
	image.src=imgd.src;
	if(image.width>0&&image.height>0){
		flag=true;
		if(image.width/image.height>=imwidth/imheight){
			if(image.width>imwidth){
				imgd.width=imwidth;
				imgd.height=(image.height*imwidth)/image.width;
			}else {
				imgd.width=image.width;				
				imgd.height=image.height;
			}
			//imgd.alt=image.width+"x"+image.height; 
		}
		else {
			if(image.height>imheight){
				imgd.height=imheight;
				imgd.width=(image.width*imheight)/image.height;
			}else{
				imgd.width=image.width;				
				imgd.height=image.height;
			}
			//imgd.alt=image.width+"x"+image.height; 
		}
	}
}