var scaleImage = function(o, w, h){ 
var img = new Image(); 
img.src = o.src; 
if(img.width >0 && img.height>0) 
{ 
	if(img.width/img.height >= w/h) 
	{ 
		if(img.width > w) 
		{ 
			o.width = w; 
			o.height = (img.height*w) / img.width; 
		} 
		else 
		{ 
			o.width = img.width; 
			o.height = img.height; 
		} 
		o.alt = img.width + "x" + img.height; 
		o.style.paddingTop = (  h - o.height ) /2 + "px";	
	} 
	else 
	{ 
		if(img.height > h) 
		{ 
			o.height = h; 
			o.width = (img.width * h) / img.height; 
		} 
		else 
		{ 
			o.width = img.width; 
			o.height = img.height;
		} 
		o.alt = img.width + "x" + img.height;
	} 
} 
}