function PreLoadImages()
{
	img1on = new Image();
	img1on.src = "nav/trans_nav.jpg";
	img2on = new Image();
	img2on.src = "nav/prof_nav.jpg";
	img3on = new Image();
	img3on.src = "nav/about_nav.jpg";
	img4on = new Image();
	img4on.src = "nav/industries_nav.jpg";
	img5on = new Image();
	img5on.src = "nav/contact_nav.jpg";

	img1off = new Image();
	img1off.src = "nav/trans_nav_F2.jpg";
	img2off = new Image();
	img2off.src = "nav/prof_nav_F2.jpg";
	img3off = new Image();
	img3off.src = "nav/about_nav_F2.jpg";
	img4off = new Image();
	img4off.src = "nav/industries_nav_F2.jpg";
	img5off = new Image();
	img5off.src = "nav/contact_nav_F2.jpg";
}

function imgOn(imgName)
{
	if (document.images)
		document[imgName].src = eval(imgName + "on.src");
}

function imgOff(imgName)
{
	if (document.images)
		document[imgName].src = eval(imgName + "off.src");
}