// set nav on states
function setNav(id,navStyle) {
	var bVersion = parseInt(navigator.appVersion);
	var bName = navigator.appName;
	var myObj = document.getElementById(id);
	if(!myObj) return;
	
	if ((bName.indexOf('Netscape')>-1 &&  bVersion  >4) ||(bName.indexOf('Explorer')>-1 && bVersion >=4)){
		myObj.className=navStyle;
	}
}

function eval_location(){ 
	if (typeof(tkeys) != 'undefined'&& tkeys.length>1) { setNav('location',tkeys,'','navOn'); 
	} 
}

// define sections 
var tkeys = new Array('introductionOn','pre-registrationOn','programOn','hotelOn','contactOn');