function preLoad(images) {
	document.preLoad = new Array();
	
	if (document.images) {
		for(i = 0; i < images.length; ++i) {
			document.preLoad[i] = new Image();
			document.preLoad[i].src = images[i];
		}
	}
}

function mouseOver(element, image) {
	if(typeof(element.src_out) == 'undefined' || element.src_out == null) {
		element.src_out = element.src;
		if(typeof(image) != 'undefined') {
			element.src = image;
		} else {
			element.src = element.src.substring(0, element.src.length - 4) + '_up' + element.src.substring(element.src.length - 4, element.src.length);
		}
	}
}

function mouseOut(element) {
	if(typeof(element.src_out) != 'undefined' && element.src_out != null) {
		element.src = element.src_out;
		element.src_out = null;
	}
}