function navOn(topnav)
{
 // turn off existing topnav and hide existing subnav
 navOff();
 //show selected nav and subnav, if one is selected
if (topnav != 'nav_') 	{
	 thishost = window.location.hostname;
	 thisprotocol = window.location.protocol;
	 var bg = 'url(' + thisprotocol + '//' + thishost + '/images/bg_' + topnav + '.gif) no-repeat';
	 var subnavDiv = 'sub' + topnav;
	 document.getElementById(topnav).style.background=bg;
	 document.getElementById(topnav).style.color='#000000';
	 // show the subnav
	 document.getElementById(subnavDiv).style.display='inline';
	}
 }
function navOff()
{
 document.getElementById('nav_company').style.background='';
 document.getElementById('nav_company').style.color='#ffffff';
 document.getElementById('subnav_company').style.display='none';

 document.getElementById('nav_products').style.background='';
 document.getElementById('nav_products').style.color='#ffffff';
 document.getElementById('subnav_products').style.display='none';

 document.getElementById('nav_results').style.background='';
 document.getElementById('nav_results').style.color='#ffffff';
 document.getElementById('subnav_results').style.display='none';

 document.getElementById('nav_resources').style.background='';
 document.getElementById('nav_resources').style.color='#ffffff';
 document.getElementById('subnav_resources').style.display='none';

 document.getElementById('nav_news').style.background='';
 document.getElementById('nav_news').style.color='#ffffff';
 document.getElementById('subnav_news').style.display='none';

 document.getElementById('nav_contact').style.background='';
 document.getElementById('nav_contact').style.color='#ffffff';
 document.getElementById('subnav_contact').style.display='none';

 document.getElementById('nav_products').style.background='';
 document.getElementById('nav_products').style.color='#ffffff';
 document.getElementById('subnav_products').style.display='none';
 
 document.getElementById('nav_login').style.background='';
 document.getElementById('nav_login').style.color='#ffffff';
 document.getElementById('subnav_login').style.display='none';
 
}