function ZoomImg(imgURL,W,H){
	if(imgURL.readyState != 'complete'){
		setTimeout("ZoomImg(imgURL,W,H)",500);
		return;
	}
	var Img = new Image();
	Img.src = imgURL.src;
	if(Img.width > 0 && Img.height > 0){
		if(Img.width / Img.height >= W / H){ //宽 > 高
			if(Img.width > W){
				Img.height = W * Img.height / Img.width;
				Img.width = W;
			}			
		}else{ //宽 < 高
			if(Img.height > H){
				Img.width = H * Img.width / Img.height;
				Img.height = H;
			}
		}
		imgURL.width = Img.width;
		imgURL.height = Img.height;

	}
}