if (document.images) {

		navBuyImgOn = new Image();
        navBuyImgOn.src = "images/nav/nav_officers_on.gif";
		navBuyImgOff = new Image();
        navBuyImgOff.src = "images/nav/nav_officers_off.gif";

		navSellImgOn = new Image();
        navSellImgOn.src = "images/nav/nav_officers_on.gif";
		navSellImgOff = new Image();
        navSellImgOff.src = "images/nav/nav_officers_off.gif";

		navServicesImgOn = new Image();
        navServicesImgOn.src = "images/nav/nav_officers_on.gif";
		navServicesImgOff = new Image();
        navServicesImgOff.src = "images/nav/nav_officers_off.gif";

		navProductsImgOn = new Image();
        navProductsImgOn.src = "images/nav/nav_officers_on.gif";
		navProductsImgOff = new Image();
        navProductsImgOff.src = "images/nav/nav_officers_off.gif";

		navCompanyImgOn = new Image();
        navCompanyImgOn.src = "images/nav/nav_officers_on.gif";
		navCompanyImgOff = new Image();
        navCompanyImgOff.src = "images/nav/nav_officers_off.gif";

		navContactUsImgOn = new Image();
        navContactUsImgOn.src = "images/nav/nav_officers_on.gif";
		navContactUsImgOff = new Image();
        navContactUsImgOff.src = "images/nav/nav_officers_off.gif";
		
}

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


function showHideLayers(id, action) {

	var obj = null;

	if (document.all) { // IE
		obj = document.all[id];
	}
	else if (document.getElementById) { // Netscape 7
		obj = document.getElementById(id);
	}
	else if (document.layers) { // Netscape 4
		obj = document.layers[id];
	}
	
	action=(action=='show')?'visible':(action='hide')?'hidden':action;

	if (!obj)
	{
		// browser not supported or element not found
	}
	else if (obj.style)
	{
		obj.style.visibility = action;
	}
	else // Navigator 4
	{
		obj.visibility = action;
	}

}