function change_image(image_name, image_src) {
    if (document.images) {
        document.images[image_name].src = image_src;
    }
}

function preload_image(image_name, image_src) {
    if (document.images) {
        eval(image_name + ' = new Image()');
        eval(image_name + '.src = "' + image_src + '"');
    }
}

/*
sfHover()
IE Drop Down Menu
*/
sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}

/*
init
*/
function init() {
	if (document.all&&document.getElementById) {sfHover()};
	preload_image('down1','images/down1.gif');
	preload_image('down2','images/down2.gif');
	preload_image('down3','images/down3.gif');
	preload_image('down4','images/down4.gif');
	preload_image('down5','images/down5.gif');
}

window.onload=init;