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

function readCookie(name)
{
  var eq = 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(eq) == 0) return c.substring(eq.length,c.length);
  }
  return null;
}

function eraseCookie(name)
{
  saveCookie(name,"",-1);
}

function isUnDefined(value) {
	var undef;
	return value==undef;
}

function addEvent(elm, evType, fn, useCapture)
{
  if (elm.addEventListener){
    elm.addEventListener(evType, fn, useCapture);
    return true;
  } else if (elm.attachEvent){
    var r = elm.attachEvent("on"+evType, fn);
    return r;
  } else {
    alert("Handler could not be added");
  }
} 

function removeEvent(elm, evType, fn, useCapture)
{
  if (elm.removeEventListener){
    elm.removeEventListener(evType, fn, useCapture);
    return true;
  } else if (elm.detachEvent){
    var r = elm.detachEvent("on"+evType, fn);
    return r;
  } else {
    alert("Handler could not be removed");
  }
}