function ShowSubNav(aNavName) {
	HideSubNav();
	var enav = document.getElementById(aNavName)
	enav.style.display = 'block';
	document.getElementById('submenu').style.display = 'block';

	if(aNavName == "submenu-advertising") {
		var nav1 = document.getElementById('menu').getElementsByTagName('li')[0];
		nav1.style.background = '#a0a0a0';
	}
	if(aNavName == "submenu-email") {
		var nav1 = document.getElementById('menu').getElementsByTagName('li')[1];
		nav1.style.background = '#a0a0a0';
	}
	if(aNavName == "submenu-lead") {
		var nav1 = document.getElementById('menu').getElementsByTagName('li')[2];
		nav1.style.background = '#a0a0a0';
	}
	if(aNavName == "submenu-sponsorships") {
		var nav1 = document.getElementById('menu').getElementsByTagName('li')[3];
		nav1.style.background = '#a0a0a0';
	}
	if(aNavName == "submenu-services") {
		var nav1 = document.getElementById('menu').getElementsByTagName('li')[4];
		nav1.style.background = '#a0a0a0';
	}
	if(aNavName == "submenu-research") {
		var nav1 = document.getElementById('menu').getElementsByTagName('li')[5];
		nav1.style.background = '#a0a0a0';
	}

	return true;
}

function HideSubNav() {
	document.getElementById('submenu-advertising').style.display = 'none';	
	document.getElementById('submenu-email').style.display = 'none';	
	document.getElementById('submenu-lead').style.display = 'none';
	document.getElementById('submenu-sponsorships').style.display = 'none';
	document.getElementById('submenu-services').style.display = 'none';
	document.getElementById('submenu-research').style.display = 'none';	
	
	return true;
}