// Pre-load images

contact= new Image(); 
contact.src="/images/gui/btn_contact_hvr.jpg"; 

expo= new Image(); 
expo.src="/images/gui/btn_news_hvr.jpg";

members= new Image(); 
members.src="/images/gui/btn_members_hvr.jpg"; 



function mouseOver( obj )
{
		document.getElementById( obj ).style.visibility = 'visible';	
}

function mouseOut( obj ) 
{
		document.getElementById( obj ).style.visibility = 'hidden';
}