function sendAjaxRequest(method, requestUrl, sendContents, whatToDoOnFinish){
// Initiaze AJAX
var XML;try{XML = new XMLHttpRequest();} catch (e){try{XML = new ActiveXObject('Msxml2.XMLHTTP');} catch (e) {try{XML = new ActiveXObject('Microsoft.XMLHTTP');} catch (e){alert('Your browser appeared to be so old that it could not work with XMLHttpRequests. Please update your browser. Preferable to the newest FireFox!');}}}
 
XML.onreadystatechange = function(){	if(XML.readyState == 4){
       eval(whatToDoOnFinish);
        }}

if (method.toLowerCase() == 'get'){
XML.open('GET', requestUrl, true);
XML.send(null);}else{
      XML.open('POST', requestUrl, true);
      XML.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
      XML.setRequestHeader('Content-length', sendContents.length);
      XML.setRequestHeader('Connection', 'close');
      XML.send(sendContents);
}
}

// Zoekfunctie
function zoeken(){
if (document.getElementById('zoekenNaar').value == 'Zoekopdracht'){
	alert('Voer een zoekterm in!');
	document.getElementById('zoekenNaar').focus();
}else{
	document.getElementById('vergrootglas').src = 'img/laadt.gif';
	document.getElementById('vergrootglas').title = 'Bezig met laden';
	document.body.style.cursor = 'wait';
	window.location = 'search.php?q='+document.getElementById('zoekenNaar').value;
}
}