var currentImg  = "";
var currentMain = "";
var currentSub  = "";

ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false

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

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

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

home_off			= new Image();
home_off.src		= "/images/rollovers/common/home_off.gif";
home_on				= new Image();
home_on.src			= "/images/rollovers/common/home_on.gif";

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

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

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

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

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

commander_off		= new Image();
commander_off.src	= "/images/rollovers/education/commander_off.gif";
commander_on		= new Image();
commander_on.src	= "/images/rollovers/education/commander_on.gif";

clinician_off		= new Image();
clinician_off.src	= "/images/rollovers/education/clinician_off.gif";
clinician_on		= new Image();
clinician_on.src	= "/images/rollovers/education/clinician_on.gif";

individual_off		= new Image();
individual_off.src	= "/images/rollovers/education/individual_off.gif";
individual_on		= new Image();
individual_on.src	= "/images/rollovers/education/individual_on.gif";

library_off			= new Image();
library_off.src		= "/images/rollovers/resource/library_off.gif";
library_on			= new Image();
library_on.src		= "/images/rollovers/resource/library_on.gif";

policies_off		= new Image();
policies_off.src	= "/images/rollovers/resource/policies_off.gif";
policies_on			= new Image();
policies_on.src		= "/images/rollovers/resource/policies_on.gif";

issuedlots_off		= new Image();
issuedlots_off.src	= "/images/rollovers/resource/issuedlots_off.gif";
issuedlots_on		= new Image();
issuedlots_on.src	= "/images/rollovers/resource/issuedlots_on.gif";

forms_off			= new Image();
forms_off.src		= "/images/rollovers/resource/forms_off.gif";
forms_on			= new Image();
forms_on.src		= "/images/rollovers/resource/forms_on.gif";

popular_off			= new Image();
popular_off.src		= "/images/rollovers/resource/popular_off.gif";
popular_on			= new Image();
popular_on.src		= "/images/rollovers/resource/popular_on.gif";

related_off			= new Image();
related_off.src		= "/images/rollovers/resource/related_off.gif";
related_on			= new Image();
related_on.src		= "/images/rollovers/resource/related_on.gif";

images_off			= new Image();
images_off.src		= "/images/rollovers/resource/images_off.gif";
images_on			= new Image();
images_on.src		= "/images/rollovers/resource/images_on.gif";

qa_off				= new Image();
qa_off.src			= "/images/rollovers/resource/qa_off.gif";
qa_on				= new Image();
qa_on.src			= "/images/rollovers/resource/qa_on.gif";

function img_act(imgName) 
{
	if(ns4 && (imgName == "commander" || imgName == "clinician" || imgName == "individual"))
	{
        imgOn = eval(imgName + "_on.src");
        document.educationSub.document [imgName].src = imgOn;
	}
	else if(ns4 && (imgName == "library" || imgName == "policies" || imgName == "issuedlots" || imgName == "forms" || imgName == "popular" || imgName == "related" || imgName == "qa"))
	{
        imgOn = eval(imgName + "_on.src");
        document.resourceSub.document [imgName].src = imgOn;
	}
	else
	{
        imgOn = eval(imgName + "_on.src");
        document [imgName].src = imgOn;
    }
}

function img_inact(imgName) 
{
	if(ns4 && (imgName == "commander" || imgName == "clinician" || imgName == "individual"))
	{
		if(currentSub != imgName && currentMain != imgName && currentImg != imgName)
		{
		    imgOff = eval(imgName + "_off.src");
		    document.educationSub.document [imgName].src = imgOff;
		}
	}
	else if(ns4 && (imgName == "library" || imgName == "policies" || imgName == "issuedlots" || imgName == "forms" || imgName == "popular" || imgName == "related" || imgName == "qa"))
	{
		if(currentSub != imgName && currentMain != imgName && currentImg != imgName)
		{
		    imgOff = eval(imgName + "_off.src");
		    document.resourceSub.document [imgName].src = imgOff;
		}
	}
	else
	{
		if(currentSub != imgName && currentMain != imgName && currentImg != imgName)
		{
		    imgOff = eval(imgName + "_off.src");
		    document [imgName].src = imgOff;
		}
	}
}

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

function selectRollovers(main, sub)
{
	currentMain	= main;
	currentSub	= sub;
	
	if(sub != '')
		img_act(sub);
	
	if(main != '')
		img_act(main);
}