image1 = new Image();
image1.src = "images/homeb.gif";

image2 = new Image();
image2.src = "images/aboutb.gif";

image3 = new Image();
image3.src = "images/servicesb.gif";

image4 = new Image();
image4.src = "images/contactb.gif";

image5 = new Image();
image5.src = "images/contact_email.gif";

image6 = new Image();
image5.src = "images/contact_phone.gif";

function showhide(layerid) {
	document.getElementById('layertwo').style.visibility="hidden";
	document.getElementById('layerthree').style.visibility="hidden";
	document.getElementById('layerfour').style.visibility="hidden";
	document.getElementById('layerfive').style.visibility="hidden";
	document.getElementById('layersix').style.visibility="hidden";
	document.getElementById('layerseven').style.visibility="hidden";
	document.getElementById('layereight').style.visibility="hidden";
	document.getElementById('layernine').style.visibility="hidden";
	document.getElementById('layerten').style.visibility="hidden";
	document.getElementById('layereleven').style.visibility="hidden";
	document.getElementById('layertwelve').style.visibility="hidden";
	document.getElementById('layerthirteen').style.visibility="hidden";
	document.getElementById('layerfourteen').style.visibility="hidden";
	document.getElementById('layerfifteen').style.visibility="hidden";
	document.getElementById('layersixteen').style.visibility="hidden";
	document.getElementById('layerseventeen').style.visibility="hidden";
	document.getElementById('layereighteen').style.visibility="hidden";
	document.getElementById(layerid).style.visibility="visible";
}