function doOnLoad() {

	preload_image('images/menu-products-over.png');
	preload_image('images/menu-services-over.png');
	preload_image('images/menu-technology-over.png');
	preload_image('images/menu-support-over.png');
	preload_image('images/menu-company-over.png');
	preload_image('images/menu-partners-over.png');
	preload_image('images/menu-contact-over.png');

}

function preload_image(imgsrc) {
	if(!window.preload_image_list) window.preload_image_list = new Array();
	var index = window.preload_image_list.length;
	window.preload_image_list[index] = new Image();
	window.preload_image_list[index].src = imgsrc;
}

function menu_onmouseover(that) {
	that.src = 'images/menu-' + that.name.substr(4) + '-over.png';
}

function menu_onmouseout(that) {
	that.src = 'images/menu-' + that.name.substr(4) + '.png';
}