function alertSize() {
	myHeight = 0;
	myHeight = document.getElementById('main').offsetHeight;
	
	if(document.all)
	{
		document.all.middle.style.height=(myHeight+65)+'px';
	}
	else
	{
		document.getElementById("middle").style.minHeight=(myHeight+65)+'px';
	}

};


function alertSizeHome() {
	myHeight = 0;
	myHeight = document.getElementById('main').offsetHeight;
	
	if(document.all)
	{
		document.all.middle.style.height=(myHeight+35)+'px';
	}
	else
	{
		document.getElementById("middle").style.minHeight=(myHeight+35)+'px';
	}

};

function MM_openBrWindow(theURL,winName,features) 
{ //v2.0
  window.open(theURL,winName,features);
}

function checkform(form)
{
	if (form.naam.value == "")
	{
		alert('U moet een naam invullen');
		form.naam.focus();
		return false;
	}
	else if (form.achternaam.value == "")
	{
		alert('U moet een achternaam invullen');
		form.achternaam.focus();
		return false;
	}
	else if (!isValidEmail(form.email.value))
	{
		alert('U moet een geldig emailadres opgeven');
		form.email.focus();
		return false;
	}
	else if (form.onderwerp.value == "")
	{
		alert('U moet een onderwerp opgeven');
		form.onderwerp.focus();
		return false;
	}	
	else if (form.opmerking.value == "")
	{
		alert('U moet een vraag of opmerking invullen');
		form.opmerking.focus();
		return false;
	}
	else
	{
		return true;
	}
}

function isValidEmail(s)
{
 var a = false;
 var res = false;
 if(typeof(RegExp) == 'function')
 {
  var b = new RegExp('abc');
  if(b.test('abc') == true){a = true;}
  }

 if(a == true)
 {
  reg = new RegExp('^([a-zA-Z0-9\\-\\.\\_]+)'+
                   '(\\@)([a-zA-Z0-9\\-\\.]+)'+
                   '(\\.)([a-zA-Z]{2,4})$');
  res = (reg.test(s));
 }
 else
 {
  res = (s.search('@') >= 1 &&
         s.lastIndexOf('.') > s.search('@') &&
         s.lastIndexOf('.') >= s.length-5)
 }
 return(res);
}

	var current = 0;

	function nextScreen()
	{
		if (current < (screenshots.length-1))
		{
			current++;
		}
		else
		{
			current = 0;
		}
		document.getElementById('screenshot').src = screenshots[current]["afb"];
		document.getElementById('naam').innerHTML = screenshots[current]["naam"];
		document.getElementById('plaats').innerHTML = screenshots[current]["plaats"];
		setCurrent();
	}

	function previousScreen()
	{
		if (current > 0)
		{
			current--;
		}
		else
		{
			current = (screenshots.length-1);
		}
		document.getElementById('screenshot').src = screenshots[current]["afb"];
		document.getElementById('naam').innerHTML = screenshots[current]["naam"];
		document.getElementById('plaats').innerHTML = screenshots[current]["plaats"];
		setCurrent();
	}

	function setCurrent()
	{
		document.getElementById('current').innerHTML = (current+1);
	}

	function setTotal()
	{
		document.getElementById('totaal').innerHTML = screenshots.length;
	}


	function preLoad(cur)
	{
		current = cur;
		if (screenshots.length > 0)
		{
			document.getElementById('screenshot').src = screenshots[current]["afb"];
			document.getElementById('naam').innerHTML = screenshots[current]["naam"];
			document.getElementById('plaats').innerHTML = screenshots[current]["plaats"];
		}


		for (var i = 1; i < screenshots.length; i++)
		{
			document.getElementById('preload').src = screenshots[i]["afb"];
		}

		setCurrent();
		setTotal();
	}

	function openScreenPopup(ID, cur)
	{
		window.open('/popup.php?limit=9999&ID='+cur+'&folderID='+ID, 'popup', 'width=468, height=355, location=no, directories=no, resizable=no, scrollbars=no, status=no, toolbar=no');
	}