var flag=false; 
function DrawImage(ImgD,w,h){ 
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; 
} 
//ImgD.alt=image.width+"*"+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; 
} 
//ImgD.alt=image.width+"*"+image.height; 
} 
} 
} 
function ShowDialog(url, width, height) {
	window.showModalDialog(url, window, "dialogWidth:" + width + "px;dialogHeight:" + height + "px;help:no;scroll:no;status:no");
	//showModalDialog创建一个显示指定 HTML 文档的模式对话框。
}