var referrerURL = document.referrer;
var referrerURLlength = referrerURL.length;
var referrerbegin = referrerURL.lastIndexOf('/')+1;
var referrerend = referrerURL.indexOf('.html');

if (referrerend != -1)
	{
		var referrerpage = referrerURL.substring(referrerbegin,referrerend);
		
		if (referrerpage == 'index') var referrerNum = 1;
		else if (referrerpage == 'about') var referrerNum = 2;
		else if (referrerpage == 'research') var referrerNum = 3;
		else if (referrerpage == 'curriculum') var referrerNum = 4;
		else if (referrerpage == 'environment') var referrerNum = 5;
		else if (referrerpage == 'participants') var referrerNum = 6;
		else if (referrerpage == 'updates') var referrerNum = 7;
		else if (referrerpage == 'vital') var referrerNum = 8;
		else if (referrerpage == 'publications') var referrerNum = 9;
		else if (referrerpage == 'press') var referrerNum = 10;
		else if (referrerpage == 'contact') var referrerNum = 11;
	}
else var referrerNum = 1;



// This is for the highlight for current section --------------------

function referrernav() {
	var referrerid = "section" + referrerNum;
	document.getElementById(referrerid).className = 'section_curr';
}

function addLoadEvent(func) {
  	var oldonload = window.onload;
  	if (typeof window.onload != 'function') {
    		window.onload = func;
  	} else {
    		window.onload = function() {
      			oldonload();
      			func();
    		}
  	}
}


addLoadEvent(referrernav);