//create global variables to hold info
var oLogoImages = new Array()
var strLogoSrc = ""

//called from pages to preload rollover images 
function preloadLogos(strDirectory,strPrefix,strExtension)
{
	//preload images for each image name passed
	for (var i=3;i<arguments.length;i++)
	{
		oLogoImages[arguments[i]] = new Image();
		oLogoImages[arguments[i]].src = strDirectory + strPrefix + arguments[i] + "." + strExtension;
	}
}  
    
function logoSwap(name)
{
	if (document.images && oLogoImages[name])
	{
		var oImage = document.images["LogoImage"];
		strLogoSrc = oImage.src;
		oImage.src = oLogoImages[name].src;
	}
}
	
function logoReturn()
{
	if (document.images)
		document.images["LogoImage"].src = strLogoSrc;
}