function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

// addLoadEvent is Simon Willson's function that allows for convenient
// addition of multiple fuctions that are all supposed to be triggered
// on window.onload event.
// takes function name as the argument. e.g. addLoadEvent(doPopups);
function addLoadEvent(func) {
	var oldonload = window.onload;
		if (typeof window.onload != 'function') {
			window.onload = func;
		} else {
			window.onload = function() {
			oldonload();
			func();
		}
	}
}

function addUnloadEvent(func) {
	var oldonunload = window.onunload;
		if (typeof window.onunload != 'function') {
			window.onunload = func;
		} else {
			window.onunload = function() {
			oldonunload();
			func();
		}
	}
}