// JavaScript Document to handle navigation rollover for dropdown menus

//function to preload the images for rollover affects.
function preloadImage(url){
	var i = new Image();
	i.src = url;
	return i;
}

//assign variables to the preloaded images
if (document.images){
	var advocateOn = preloadImage(siteRoot+"/images/three_boxes/change/link_1b.jpg");
	var advocateOff = preloadImage(siteRoot+"/images/three_boxes/change/link_1.jpg");
	
	var patientsOn = preloadImage(siteRoot+"/images/three_boxes/patients_first/link_3b.jpg");
	var patientsOff = preloadImage(siteRoot+"/images/three_boxes/patients_first/link_3.jpg");
	
	var healthOn = preloadImage(siteRoot+"/images/three_boxes/get_info/link_2b.jpg");
	var healthOff = preloadImage(siteRoot+"/images/three_boxes/get_info/link_2.jpg");
}


function mouseOn(btn){
	var button = document.getElementById(btn+"_link");
	button.style.backgroundImage = "url("+siteRoot+"images/nav_images/bluearrow02.jpg)";
	button.style.backgroundColor = "#7ab7dd";
	closeMenu();
}
function mouseOff(btn){
	var button = document.getElementById(btn+"_link");
	button.style.backgroundImage = "url("+siteRoot+"images/nav_images/bluearrow01.jpg)";
	button.style.backgroundColor = "#2589c8";
}

function mainImgOn(imgName){
	if(document.images){
		document.getElementById(imgName).src=eval(imgName + "On.src");
	}
}

function mainImgOff(imgName){
	if(document.images){
		document.getElementById(imgName).src=eval(imgName + "Off.src");
	}
}