var currentImg = "";
ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false

sitemap_off			= new Image();
sitemap_off.src		= "/images/rollovers/home/sitemap_off.gif";
sitemap_on			= new Image();
sitemap_on.src		= "/images/rollovers/home/sitemap_on.gif";

contactus_off		= new Image();
contactus_off.src	= "/images/rollovers/home/contactus_off.gif";
contactus_on		= new Image();
contactus_on.src	= "/images/rollovers/home/contactus_on.gif";

threat_off			= new Image();
threat_off.src		= "/images/rollovers/home/threat_off.gif";
threat_on			= new Image();
threat_on.src		= "/images/rollovers/home/threat_on.gif";

disease_off			= new Image();
disease_off.src		= "/images/rollovers/home/disease_off.gif";
disease_on			= new Image();
disease_on.src		= "/images/rollovers/home/disease_on.gif";

vaccine_off			= new Image();
vaccine_off.src		= "/images/rollovers/home/vaccine_off.gif";
vaccine_on			= new Image();
vaccine_on.src		= "/images/rollovers/home/vaccine_on.gif";

event_off			= new Image();
event_off.src		= "/images/rollovers/home/event_off.gif";
event_on			= new Image();
event_on.src		= "/images/rollovers/home/event_on.gif";

whatsnew_off		= new Image();
whatsnew_off.src	= "/images/rollovers/home/whatsnew_off.gif";
whatsnew_on			= new Image();
whatsnew_on.src		= "/images/rollovers/home/whatsnew_on.gif";

email_off			= new Image();
email_off.src		= "/images/rollovers/home/email_off.gif";
email_on			= new Image();
email_on.src		= "/images/rollovers/home/email_on.gif";

education_off		= new Image();
education_off.src	= "/images/rollovers/home/education_off.gif";
education_on		= new Image();
education_on.src	= "/images/rollovers/home/education_on.gif";

resource_off		= new Image();
resource_off.src	= "/images/rollovers/home/resource_off.gif";
resource_on			= new Image();
resource_on.src		= "/images/rollovers/home/resource_on.gif";

function img_act(imgName) 
{
        imgOn = eval(imgName + "_on.src");
        document [imgName].src = imgOn;
}

function img_inact(imgName) 
{
	if(currentImg != imgName)
	{
        imgOff = eval(imgName + "_off.src");
        document [imgName].src = imgOff;
    }
}

function img_sel(imgName)
{
	temp = currentImg;
	currentImg = imgName;
	
	if(temp != "")
		img_inact(temp);
}