var home = new Image ();
home.src = 'img/nav_hl_home.gif';
var hoeren = new Image ();
hoeren.src = 'img/nav_hl_hoeren.gif';
var sehen = new Image ();
sehen.src = 'img/nav_hl_sehen.gif';
var lesen = new Image ();
lesen.src = 'img/nav_hl_lesen.gif';
var schreiben = new Image ();
schreiben.src = 'img/nav_hl_schreiben.gif';
var weiterklicken = new Image ();
weiterklicken.src = 'img/nav_hl_weiterklicken.gif';
var kaufen = new Image ();
kaufen.src = 'img/nav_hl_kaufen.gif';
var erleben = new Image ();
erleben.src = 'img/nav_hl_erleben.gif';

function swapNavImg (image, highlight) 
{
	document.images[image].src = 'img/nav_' + (highlight? 'hl_' : 'df_') + image + '.gif';
}

function popUp (url, name, w, h)
{
	prm = "height=" + h + ",width=" + w + ",scrollbars=0,left=" + (screen.width -w) / 2 + ",top=" + parseInt ((screen.height - h) / 3);
	win = window.open (url, name, prm);
}

function checkEmail ($form) 
{
	var usr = "([a-zA-Z0-9][a-zA-Z0-9_.-]*|\"([^\\\\\x80-\xff\015\012\"]|\\\\[^\x80-\xff])+\")";
	var domain = "([a-zA-Z0-9][a-zA-Z0-9._-]*\\.)*[a-zA-Z0-9][a-zA-Z0-9._-]*\\.[a-zA-Z]{2,5}";
	var regex = "^"+usr+"\@"+domain+"$";
	var myrxp = new RegExp(regex);
	var check = (myrxp.test ($form.email.value));
	if (!check)
	{
		alert ("Diese eMail-Adresse ist ungültig...");   
	  	document.newsletter.email.focus();
		return false;
	}
	return true;
}