//-------- ͼƬµÈ±ÈÀýËõ·Å ---------------------
function pimsize(obj,widths,heights)
{
var imgname = document.getElementById(obj);

if(navigator.appName == "Microsoft Internet Explorer") 
{ 
	if(navigator.appVersion.match(/7./i)=='7.') 
	{ 
		imgname.width = widths;
		imgname.height = heights;
	} //alert("IE7.0");
	else
	{ 
		var w; 
		var h; 
		w=imgname.width;
		h=imgname.height;
		if(imgname.width>widths)
		{ 
			do 
				w=w-1; 
			while (w>widths) ; 

			s=w/imgname.width; 
			
			imgname.width=w; 
			imgname.height=h*s; 
			h=imgname.height 
		} 
		 
		if(imgname.height>heights)
		{ 
			do 
				h=h-1; 
			while (h>heights) ; 
			s=h/imgname.height; 
			imgname.width=w*s; 
			imgname.height=heights; 
		}
	}
}
else
{
	var w; 
	var h; 
	w=imgname.width;
	h=imgname.height;
	if(imgname.width>widths)
	{ 
		do 
			w=w-1; 
		while (w>widths) ; 

		s=w/imgname.width; 
		
		imgname.width=w; 
		imgname.height=h*s; 
		h=imgname.height 
	} 
	 
	if(imgname.height>heights)
	{ 
		do 
			h=h-1; 
		while (h>heights) ; 
		s=h/imgname.height; 
		imgname.width=w*s; 
		imgname.height=heights; 
	}

}
 /////////////////////
   
var div;
if(document.getElementById("pic_show")) 
{
	div = document.getElementById("pic_show");
	var height = div.style.height;    
	var width = div.style.width;
	imgname.style.marginTop = (parseInt(height,10) - imgname.offsetHeight) / 2 + "px"; 
}
else
{
	imgname.style.marginTop = (heights - imgname.offsetHeight) / 2 + "px"; 
	//imgname.style.marginLeft = (widths - imgname.offsetWidth) / 2 + "px";
}
}