function ajax(url,id,num) {																										
	if(id=="kalender" && lokatie=="reservations") {
		document.getElementById('verblijfsduur').disabled='true';
		return;
	}
	else {
		var httpObj = false;																											
			httpObj = window.XMLHttpRequest ? new window.XMLHttpRequest : (window.ActiveXObject ? new ActiveXObject("MSXML2.XMLHTTP"): null);
			httpObj.onreadystatechange = function() {		
			if (httpObj.readyState == 4) {
				if(id=="email"){
					document.getElementById("imgemail").style.visibility=httpObj.responseText;
					if(frm=='contact') {
						contactCheck("email");
					}
					else {
						formCheck("email");
					}
				}
				else if(id=="kalender"){
					document.getElementById(id).innerHTML = httpObj.responseText;
					document.getElementById('verblijfsduur').focus();
					if(id=="kalender" && lokatie=="reservations") {
						location.href='/apartments/';
					}
				}
				else if(id=="exrate"){
					result = (httpObj.responseText/1)*(rate/1);
				}
				else {
					document.getElementById(id).innerHTML = httpObj.responseText;
				}
				return;																											
			}
		}	
	};																															
	httpObj.open('POST', url, true);																					
	httpObj.send(null);	

}