// preload navigation images:

if (document.images) {

		consumables_on = new Image();
		consumables_on.src = "images/consumables_on.gif";
		consumables_off = new Image();
		consumables_off.src = "images/consumables_off.gif";

		machinery_on = new Image();
		machinery_on.src = "images/machinery_on.gif";
		machinery_off = new Image();
		machinery_off.src = "images/machinery_off.gif";

		catering_on = new Image();
		catering_on.src = "images/catering_on.gif";
		catering_off = new Image();
		catering_off.src = "images/catering_off.gif";

		washroom_on = new Image();
		washroom_on.src = "images/washroom_on.gif";
		washroom_off = new Image();
		washroom_off.src = "images/washroom_off.gif";

		safety_on = new Image();
		safety_on.src = "images/safety_on.gif";
		safety_off = new Image();
		safety_off.src = "images/safety_off.gif";

		washcon_on = new Image();
		washcon_on.src = "images/washcon_on.gif";
		washcon_off = new Image();
		washcon_off.src = "images/washcon_off.gif";

}
                        
function hiLite(imgID,changeID) {
                        
        if (document.images) {
        document.images[imgID].src = eval(changeID + ".src");
        return true;
        }
}


$(document).ready(function()
{
	/* much improved hover function. hjb dec 2010 */
	$('#mainnav a').each(function(i,e)
	{
		/* preload */
		$('<img/>').load(function(){}).attr('src', $(e).children().attr('src').replace(/_off/,'_on'));
	
	}).hover(function()
	{
		var img = $(this).children();
		img.attr('src', img.attr('src').replace(/_off/,'_on'));
	},
	function()
	{
		var img = $(this).children();
		img.attr('src', img.attr('src').replace(/_on/,'_off'));
	});
});