var	btn_home = new Image();
var	btn_home_o = new Image();
var btn_free_stuff = new Image();
var btn_free_stuff_o = new Image();
var btn_who_we_work = new Image();
var btn_who_we_work_o = new Image();
var	btn_how_work = new Image();
var	btn_how_work_o = new Image();
var	btn_service = new Image();
var	btn_service_o = new Image();
var	btn_case_studies = new Image();
var	btn_case_studies_o = new Image();
var	btn_about_us = new Image();
var	btn_about_us_o = new Image();
var	btn_contact_us = new Image();
var	btn_contact_us_o = new Image();

function changeImages(par)
{
	if(document.images && preloadFlag == true)
	{
		if(par == "btn_home") document.btn_home.src = btn_home.src;
		if(par == "btn_home_o") document.btn_home.src = btn_home_o.src;
		if(par == "btn_free_stuff") document.btn_free_stuff.src = btn_free_stuff.src;
		if(par == "btn_free_stuff_o") document.btn_free_stuff.src = btn_free_stuff_o.src;
		if(par == "btn_who_we_work") document.btn_who_we_work.src = btn_who_we_work.src;
		if(par == "btn_who_we_work_o") document.btn_who_we_work.src = btn_who_we_work_o.src;
		if(par == "btn_how_work") document.btn_how_work.src = btn_how_work.src;
		if(par == "btn_how_work_o") document.btn_how_work.src = btn_how_work_o.src;
		if(par == "btn_service") document.btn_service.src = btn_service.src;
		if(par == "btn_service_o") document.btn_service.src = btn_service_o.src;
		if(par == "btn_case_studies") document.btn_case_studies.src = btn_case_studies.src;
		if(par == "btn_case_studies_o") document.btn_case_studies.src = btn_case_studies_o.src;
		if(par == "btn_about_us") document.btn_about_us.src = btn_about_us.src;
		if(par == "btn_about_us_o") document.btn_about_us.src = btn_about_us_o.src;
		if(par == "btn_contact_us") document.btn_contact_us.src = btn_contact_us.src;
		if(par == "btn_contact_us_o") document.btn_contact_us.src = btn_contact_us_o.src;
	}
}

var preloadFlag = false;
function preloadImages()
{
	if (document.images)
	{
		btn_home.src = "images/btn_home.gif"
		btn_home_o.src = "images/btn_home_o.gif"
		btn_free_stuff.src = "images/btn_free_stuff.gif"
		btn_free_stuff_o.src = "images/btn_free_stuff_o.gif"
		btn_who_we_work.src = "images/btn_who_we_work.gif"
		btn_who_we_work_o.src = "images/btn_who_we_work_o.gif"
		btn_how_work.src = "images/btn_how_work.gif"
		btn_how_work_o.src = "images/btn_how_work_o.gif"
		btn_service.src = "images/btn_service.gif"
		btn_service_o.src = "images/btn_service_o.gif"
		btn_case_studies.src = "images/btn_case_studies.gif"
		btn_case_studies_o.src = "images/btn_case_studies_o.gif"
		btn_about_us.src = "images/btn_about_us.gif"
		btn_about_us_o.src = "images/btn_about_us_o.gif"
		btn_contact_us.src = "images/btn_contact_us.gif"
 		btn_contact_us_o.src = "images/btn_contact_us_o.gif"
	}
	preloadFlag = true;
}