var preloadFlag = false;
function preLoad() 
	{
	if (document.images) 
		{ 
		img1on  = new Image();img1on.src =  "/images/home/btn_home_on.gif";
		img1off = new Image();img1off.src = "/images/home/btn_home_off.gif";
		img2on  = new Image();img2on.src =  "/images/home/btn_comm_on.gif";
		img2off = new Image();img2off.src = "/images/home/btn_comm_off.gif";
		img3on  = new Image();img3on.src =  "/images/home/btn_port_r_on.gif";
		img3off = new Image();img3off.src = "/images/home/btn_port_r_off.gif";
		img4on  = new Image();img4on.src =  "/images/home/btn_port_c_on.gif";
		img4off = new Image();img4off.src = "/images/home/btn_port_c_off.gif";
		img5on  = new Image();img5on.src =  "/images/home/btn_services_on.gif";
		img5off = new Image();img5off.src = "/images/home/btn_services_off.gif";
		img6on  = new Image();img6on.src =  "/images/home/btn_about_on.gif";
		img6off = new Image();img6off.src = "/images/home/btn_about_off.gif";
		img7on  = new Image();img7on.src =  "/images/home/btn_contact_on.gif";
		img7off = new Image();img7off.src = "/images/home/btn_contact_off.gif";
		preloadFlag = true;
		}
	}
function change()
	{
	if (document.images && (preloadFlag == true))
		{
		for (var i=0; i<change.arguments.length; i+=2)
			{
			document[change.arguments[i]].src = eval(change.arguments[i+1] + ".src");
			}
		}
	}