function show_subnav(nav,subnav){

	if(document.getElementById(subnav)){
		document.getElementById(current_subnav).style.display = "none";
		document.getElementById(subnav).style.display = "block";
		current_subnav = subnav;
	}
	
	if(document.getElementById(nav)){
	
		if(current_nav != ""){
			if(document.getElementById(current_nav).className != "main_nav_on"){
				document.getElementById(current_nav).className = "main_nav";
			}
		}
		if(document.getElementById(nav).className != "main_nav_on"){
			document.getElementById(nav).className = "main_nav_over";
		}
		
		current_nav = nav;
	}
}

function footerRollOver(pos) 
{
	if(pos=="left"){
		document.getElementById("footer_left").className = "footer_left_on";
	}else{
		document.getElementById("footer_right").className = "footer_right_on";
	}
}

function footerRollOff(pos) 
{
	if(pos=="left"){
		document.getElementById("footer_left").className = "footer_left_off";
	}else{
		document.getElementById("footer_right").className = "footer_right_off";
	}
}