function FlipNav1On()
{
	document.getElementById("frntpghomebtn").src="imagesmantle/galleries_dn.jpg";
	return;
}

function FlipNav1Off()
{
	document.getElementById("frntpghomebtn").src="imagesmantle/galleries.jpg";
	return;
}

function FlipNav2On()
{
	document.getElementById("frntpgaboutbtn").src="imagesmantle/bio_dn.jpg";
	return;
}

function FlipNav2Off()
{
	document.getElementById("frntpgaboutbtn").src="imagesmantle/bio.jpg";
	return;
}

function FlipNav3On()
{
	document.getElementById("frntpgpanoramabtn").src="imagesmantle/panorama_dn.jpg";
	return;
}

function FlipNav3Off()
{
	document.getElementById("frntpgpanoramabtn").src="imagesmantle/panorama.jpg";
	return;
}

function FlipNav4On()
{
	document.getElementById("frntpgcontactbtn").src="imagesmantle/contact_dn.jpg";
	return;
}

function FlipNav4Off()
{
	document.getElementById("frntpgcontactbtn").src="imagesmantle/contact.jpg";
	return;
}

if (typeof document.getElementById("frntpghomebtn").addEventListener != "undefined")
{
	document.getElementById("frntpghomebtn").addEventListener("mouseover",FlipNav1On,false);
	document.getElementById("frntpgaboutbtn").addEventListener("mouseover",FlipNav2On,false);
	document.getElementById("frntpgpanoramabtn").addEventListener("mouseover",FlipNav3On,false);
	document.getElementById("frntpgcontactbtn").addEventListener("mouseover",FlipNav4On,false);

	document.getElementById("frntpghomebtn").addEventListener("mouseout",FlipNav1Off,false);
	document.getElementById("frntpgaboutbtn").addEventListener("mouseout",FlipNav2Off,false);
	document.getElementById("frntpgpanoramabtn").addEventListener("mouseout",FlipNav3Off,false);
	document.getElementById("frntpgcontactbtn").addEventListener("mouseout",FlipNav4Off,false);
}

if (typeof document.getElementById("frntpghomebtn").attachEvent != "undefined")
{
	document.getElementById("frntpghomebtn").attachEvent("onmouseover",FlipNav1On);
	document.getElementById("frntpgaboutbtn").attachEvent("onmouseover",FlipNav2On);
	document.getElementById("frntpgpanoramabtn").attachEvent("onmouseover",FlipNav3On);
	document.getElementById("frntpgcontactbtn").attachEvent("onmouseover",FlipNav4On);

	document.getElementById("frntpghomebtn").attachEvent("onmouseout",FlipNav1Off);
	document.getElementById("frntpgaboutbtn").attachEvent("onmouseout",FlipNav2Off);
	document.getElementById("frntpgpanoramabtn").attachEvent("onmouseout",FlipNav3Off);
	document.getElementById("frntpgcontactbtn").attachEvent("onmouseout",FlipNav4Off);
}