// JavaScript Document

function preload_images() {
	var doc = document;
	if (doc.images) {
		if(!doc.myImages) {
			doc.myImages = new Array();
		}
		var j = doc.myImages.length
		var a = preload_images.arguments;
		for (var i=0; i<a.length; i++) {
			doc.myImages[j] = new Image();
			doc.myImages[j].src = a[i];
			j++;
		}
	}
}

function swap_css(selector)
{
	var originalImg = selector.style.backgroundImage;
	if (originalImg.indexOf('_ovr')<0) {
		//mouse is over
		selector.style.backgroundImage = originalImg.replace('.jpg', '_ovr.jpg');
		selector.firstChild.style.color = "#FFCC00";
	} else {
		//mouse is out
		selector.style.backgroundImage = originalImg.replace('_ovr.jpg','.jpg');
		selector.firstChild.style.color = "white";
	}
}

function create_nav_container(id)
{
	
	navRegistry[id] = document.getElementById(id);
	navRegistry[id].style.backgroundImage = "url(/images/"+id.toLowerCase()+".jpg)";

	navRegistry[id].onmouseover = function() {
		swap_css(this);
	}

	navRegistry[id].onmouseout = function() {
		swap_css(this);
	}
}