function over(img)
{
	img.src = img.src.replace(/.gif/, '_over.gif');
}

function out(img)
{
	img.src = img.src.replace(/_over.gif/, '.gif');
}

function newImage(src)
{
	var img = new Image();
	img.src = src;
	return img;
}

var preloadFlag = false;
function preloadImages()
{
	if (preloadFlag) return;
	preloadFlag = true;

	products_over = newImage("images/products_over.gif");
	services_over = newImage("images/services_over.gif");
	web_over = newImage("images/web_over.gif");
	contact_over = newImage("images/contact_over.gif");
	about_over = newImage("images/about_over.gif");
	support_over = newImage("images/support_over.gif");
	home_over = newImage("images/home_over.gif");
}