function IsEmail(string) {
	if (string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
	return true;
	else
	return false;
}

function ValidateForm(form)
{

   if(IsEmail(form.newsletter_email.value)) 
   { 
      return true; 
   } 

	alert('Ongeldig e-mail adres');
	form.newsletter_email.focus(); 
	return false;
}

function checkBrowser(){
	this.ver=navigator.appVersion
	this.dom=document.getElementById?1:0
	this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom)?1:0;
	this.ie4=(document.all && !this.dom)?1:0;
	this.ns5=(this.dom && parseInt(this.ver) >= 5) ?1:0;
	this.ns4=(document.layers && !this.dom)?1:0;
	this.bw=(this.ie5 || this.ie4 || this.ns4 || this.ns5)
	return this
}

/*
plus = new Image();
plus.src = "images/plus.gif";
minus = new Image();
minus.src = "images/minus.gif";
empty = new Image();
empty.src = "images/_.gif";
*/


bw=new checkBrowser()

function showHide(div,level,nest){
/*	plus = new Image();
	minus = new Image();
	empty = new Image();
	if (level == 1)
	{
		plus.src  = url_layout+"topLevelClosed.gif";
		minus.src = url_layout+"topLevelOpen.gif";
		empty.src = url_layout+"empty.gif";
	}
	else if (level == 2) {
		plus.src  = url_layout+"levelOneClosed.gif";
		minus.src = url_layout+"levelOneOpen.gif";
		empty.src = url_layout+"empty.gif";
	}
	else {
		plus.src = url_layout+"images/lowLevelClosed.gif";
		minus.src = url_layout+"images/lowLevelOpen.gif";
		empty.src = url_layout+"images/empty.gif";
	}
	*/
	obj=bw.dom?document.getElementById(div).style:bw.ie4?document.all[div].style:bw.ns4?nest?document[nest].document[div]:document[div]:0; 
	if(obj.display=='block' || obj.display=='block') {
		obj.display='none';
		/*
		if (document.images["img_" + div].src == minus.src)
		{
			document.images["img_" + div].src = plus.src;
		}
		*/
	}
	else {
		obj.display='block';
		/*
		if (document.images["img_" + div].src == plus.src)
		{
			document.images["img_" + div].src = minus.src;
		}
		*/
	}
}

function show(div,nest){
	obj=bw.dom?document.getElementById(div).style:bw.ie4?document.all[div].style:bw.ns4?nest?document[nest].document[div]:document[div]:0; 
	obj.display='block'
}

function hide(div,nest){
	obj=bw.dom?document.getElementById(div).style:bw.ie4?document.all[div].style:bw.ns4?nest?document[nest].document[div]:document[div]:0; 
	obj.display='none'
}