var pageAlign;
function resize()
{
	var winW = 630;
	var winH = 460;
	
	if(parseInt(navigator.appVersion)>3)
	{
		if (navigator.appName=="Netscape")
		{
			winW = window.innerWidth-16;
			winH = window.innerHeight-16;
		}
		if(navigator.appName.indexOf("Microsoft")!=-1)
		{
			winW = document.body.offsetWidth-20;
			winH = document.body.offsetHeight-20;
		}
	}
	
	var pageAlign = (winW < 1000)
			? 'pageTopLeft'
			: 'pageCenter';
	
	var page = document.getElementById('page');
	if(page.className != pageAlign) page.className = pageAlign;
}

function fullscreen()
{
	var aw = screen.availWidth;
	var ah = screen.availHeight;
	
	window.moveTo(0,0);
	if(document.all)
	{
		window.resizeTo(aw, ah);
	}
	else if(document.layers||document.getElementById)
	{
		if(top.window.outerHeight < ah || top.window.outerWidth < aw)
		{
			top.window.outerHeight = ah;
			top.window.outerWidth = aw;
		}
	}
	resize();
}


var SIDString = '';

function getRandomLetter() {
	return String.fromCharCode(getRandom(65, 90));
}
function getRandom(lowerBound, upperBound) {
	return Math.floor((upperBound - lowerBound + 1) * Math.random() + lowerBound);
}
function SetSID(){
	if (SIDString.length > 0){
		return SIDString;
	}
	sidc = 0;
	while (sidc < 32){
		SIDString = SIDString + getRandomLetter();
		sidc++;
	}
	return SIDString;
}
function writeCaptcha()
{
	var url = "http://www.merlet.nl/nieuwsbrief/admin/resources/form_designs/captcha/index.php?c=" + getRandom(1,1000);
	document.write("<img src='" + url + "' alt='Captcha Image'/>");
}
function CheckMultiple4(frm, name) {
	for (var i=0; i < frm.length; i++)
	{
		fldObj = frm.elements[i];
		fldId = fldObj.id;
		if (fldId) {
			var fieldnamecheck=fldObj.id.indexOf(name);
			if (fieldnamecheck != -1) {
				if (fldObj.checked) {
					return true;
				}
			}
		}
	}
	return false;
}
function CheckForm4(f) {
	if (f.email.value == "") {
		alert("Vul aub uw email adres in.");
		f.email.focus();
		return false;
	}

	if (f.captcha.value == "") {
		alert("Vul aub de getoonde beveiligings code in.");
		f.captcha.focus();
		return false;
	}
	
	var fname = "CustomFields_2_4";
	var fld = document.getElementById(fname);
	if (fld.value == "") {
		alert("Vul aub uw naam in.");
		fld.focus();
		return false;
	}
	return true;
};