function doRollover(navname) {
	//changes the table cell bgcolor on rollover
	if (document.getElementById) {  //IE5+ and NS6
		document.getElementById('nav_'+navname).style.backgroundImage = "url(./images/rollover.gif)";
	} else if (document.layers) {  //NS4
		document.layers['nav_'+navname].bgColor = "#D90000";
	} else if (document.all) {  //IE4
		document.layers['nav_'+navname].bgColor = "#D90000";
	}
}
function doRollout(navname) {
	//changes the table cell bgcolor on rollover
	if (document.getElementById) {  //IE5+ and NS6
		document.getElementById('nav_'+navname).style.backgroundImage = "";
	} else if (document.layers) {  //NS4
		document.layers['nav_'+navname].bgColor = "";
	} else if (document.all) {  //IE4
		document.layers['nav_'+navname].bgColor = "";
	}
}