if(document.images)
{
	// main nav
	var aboutpi_1 = new Image(); aboutpi_1.src = "Assets/Images/bt_aboutPI_1.gif";
	var aboutpi_2 = new Image(); aboutpi_2.src = "Assets/Images/bt_aboutPI_2.gif";
	var productsearch_1 = new Image(); productsearch_1.src = "Assets/Images/bt_productsearch_1.gif";
	var productsearch_2 = new Image(); productsearch_2.src = "Assets/Images/bt_productsearch_2.gif";
	
	// utility nav
	var email_1 = new Image(); email_1.src = "Assets/Images/bt_email_1.jpg";
	var email_2 = new Image(); email_2.src = "Assets/Images/bt_email_2.jpg";
	var contactus_1 = new Image(); contactus_1.src = "Assets/Images/bt_contactus_1.jpg";
	var contactus_2 = new Image(); contactus_2.src = "Assets/Images/bt_contactus_2.jpg";
}

function imgSwap(imgName,newImg,winStat)
{
	if (document.images)
	{
		document.images[imgName].src = eval(newImg + ".src");
		window.status = winStat;
	}
}