function browser_check() {
    if (window.XMLHttpRequest) {
        return new XMLHttpRequest();
    } else if(window.ActiveXObject) {
        return new ActiveXObject("Microsoft.XMLHTTP");
    } else {
        document.write("U heeft geen goede browser..");
    }
}            

var ajax = browser_check();        

function getPage(pageName, aName) {
    var link = pageName + '?rand=' + Math.random();
	var activelink = aName;
	document.getElementById('algemeen').setAttribute("class", "tab");
	document.getElementById('woningaanbod').setAttribute("class", "tab");
	document.getElementById('projectinformatie').setAttribute("class", "tab");
	document.getElementById('tellafriend').setAttribute("class", "tab");
	document.getElementById('contacttab').setAttribute("class", "tab");
	document.getElementById(activelink).setAttribute("class", "activetab");

    if (ajax.readyState == 4 || ajax.readyState == 0) {
        ajax.open("GET", link, true);
        ajax.onreadystatechange = handleGetPage; 
        ajax.send(null);
    }            
}

function handleGetPage() {
    if (ajax.readyState == 4) {
        drawPage();
    }
}

function drawPage() {
    page = ajax.responseText;
    document.getElementById('projectinfo_contentbox').innerHTML = page;
	$("a.woningalbumlink").fancybox();
}