// JavaScript Document
//js缩略图
function DrawImage(ImgD, width_s, height_s) {
	var image = new Image();    
	image.src = ImgD.src;    
	//alert(image.src);
	if (image.width > 0 && image.height > 0) {
		flag = true;        
		if (image.width / image.height >= width_s / height_s) {
			if (image.width > width_s) {
				ImgD.width = width_s;                
				ImgD.height = (image.height * width_s) / image.width;
			} else {                
				ImgD.width = image.width;                
				ImgD.height = image.height;            
			}        
		}else{            
			if (image.height > height_s) {
				ImgD.height = height_s;
				ImgD.width = (image.width * height_s) / image.height;
			} else {
				ImgD.width = image.width;                
				ImgD.height = image.height;            
			}        
		}    
	}else {        
		ImgD.src = "";
		ImgD.alt = ""    
	}
}