var alertTimerId = 0;

function display(area)
{		
	clearTimeout ( alertTimerId );
	
	if(area == 1)
	{
		document.getElementById('nav_about').style.display = 'block';
		document.getElementById('nav_services').style.display = 'none';
		document.getElementById('nav_careers').style.display = 'none';
		document.getElementById('nav_contact').style.display = 'none';
	}
	if(area == 2)
	{
		document.getElementById('nav_services').style.display = 'block';
		document.getElementById('nav_about').style.display = 'none';
		document.getElementById('nav_careers').style.display = 'none';
		document.getElementById('nav_contact').style.display = 'none';				
	}
	if(area == 3)
	{
		document.getElementById('nav_careers').style.display = 'block';
		document.getElementById('nav_about').style.display = 'none';
		document.getElementById('nav_services').style.display = 'none';
		document.getElementById('nav_contact').style.display = 'none';				
	}
	if(area == 4)
	{
		document.getElementById('nav_contact').style.display = 'block';
		document.getElementById('nav_about').style.display = 'none';
		document.getElementById('nav_services').style.display = 'none';
		document.getElementById('nav_careers').style.display = 'none';			
	}
}
function hide()
{
	clearTimeout ( alertTimerId );
	alertTimerId = setTimeout ( "hideAll()", 3000 );				
}
function hideAll()
{			
	document.getElementById('nav_about').style.display = 'none';
	document.getElementById('nav_services').style.display = 'none';
	document.getElementById('nav_careers').style.display = 'none';
	document.getElementById('nav_contact').style.display = 'none';
}