var onthoud = new Array('naam','adres','plaats','email','telefoon');
var verplicht = new Array('naam','adres','plaats','telefoon');

function setCookie()
{
	var theForm = document.forms[0];
	if (theForm.cookie.checked)
	{
		var cookiestring = '';
		for (var i=0;i<onthoud.length;i++)
		{
			if (theForm.elements[onthoud[i]])
				cookiestring += theForm.elements[onthoud[i]].name + ':' + theForm.elements[onthoud[i]].value + '&';
		}
		cookiestring = cookiestring.substring(0,cookiestring.length-1);
		createCookie('persoonsgegevens',cookiestring,30);
	}
	else
		eraseCookie('persoonsgegevens');
}


function retrieveCookie()
{
	var gegevens = readCookie('persoonsgegevens');
	if (!gegevens) return;
	var temp = new Array();
	var temp2 = new Array();
	temp = gegevens.split('&');
	for (var i=0;i<temp.length;i++)
	{
		temp2 = temp[i].split(':');
		if (document.forms[0].elements[temp2[0]])
			document.forms[0].elements[temp2[0]].value = temp2[1];
	}
}

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;
}

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

function checkForm()
{
	var theForm = document.forms[0];
	for (var i=0;i<verplicht.length;i++)
	{
		var tmp = theForm.elements[verplicht[i]];
		if (tmp && !tmp.value)
		{
			alert('Vul aub. uw ' + tmp.name + ' in.');
			tmp.focus();
			return false;
		}
	}
	setCookie();
	return true;
}

function getObj(name)
{
  if (document.getElementById)
  {
  	this.obj = document.getElementById(name);
	this.style = document.getElementById(name).style;
  }
  else if (document.all)
  {
	this.obj = document.all[name];
	this.style = document.all[name].style;
  }
  else if (document.layers)
  {
   	this.obj = document.layers[name];
   	this.style = document.layers[name];
  }
}