if (document.images) {
	img1on = new Image();
	img1on.src ="images/overview_over.gif";
	img2on = new Image();
	img2on.src ="images/services_over.gif";
	img3on = new Image();
	img3on.src ="images/clients_over.gif";
	img4on = new Image();
	img4on.src ="images/portfolio_over.gif";
	img5on = new Image();
	img5on.src ="images/staff_over.gif";
	img6on = new Image();
	img6on.src ="images/AboutHOC_over.gif";
	img7on = new Image();
	img7on.src ="images/ContactUs_over.gif";

	img1off = new Image();
	img1off.src ="images/overview_up.gif";
	img2off = new Image();
	img2off.src ="images/services_up.gif";
	img3off = new Image();
	img3off.src ="images/clients_up.gif";
	img4off = new Image();
	img4off.src ="images/portfolio_up.gif";
	img5off = new Image();
	img5off.src ="images/staff_up.gif";
	img6off = new Image();
	img6off.src ="images/AboutHOC_up.gif";
	img7off = new Image();
	img7off.src ="images/ContactUs_up.gif";
}

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");
	}
}