// main navigation
var servicessolutions_off = new Image();
servicessolutions_off.src = '/images/nav_servicessolutions_off.gif';
var servicessolutions_over = new Image();
servicessolutions_over.src = '/images/nav_servicessolutions_on.gif';

var todayschallenges_off = new Image();
todayschallenges_off.src = '/images/nav_todayschallenges_off.gif';
var todayschallenges_over = new Image();
todayschallenges_over.src = '/images/nav_todayschallenges_on.gif';

var aboutus_off = new Image();
aboutus_off.src = '/images/nav_aboutus_off.gif';
var aboutus_over = new Image();
aboutus_over.src = '/images/nav_aboutus_on.gif';

var home_off = new Image();
home_off.src = '/images/nav_home_off.gif';
var home_over = new Image();
home_over.src = '/images/nav_home_on.gif';




function rollOnById(imgname) {
	if (imgname == "") {
		return;	
	}
  	document.getElementById(imgname).src = eval(imgname + '_over.src');
}
    
function rollOffById(imgname) {
	if (imgname == "") {
		return;	
	}
	document.getElementById(imgname).src = eval(imgname + '_off.src');
}