var http_request = false;
function makePOSTRequest(url, parameters) {
	http_request = false;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
	 http_request = new XMLHttpRequest();
	 if (http_request.overrideMimeType) {
	 // set type accordingly to anticipated content type
	 //http_request.overrideMimeType('text/xml');
		http_request.overrideMimeType('text/html');}
	 } else if (window.ActiveXObject) { // IE
		try {
		http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
		try {
		http_request = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (e) {}
		}
	}
	if (!http_request) {
		alert('Cannot create XMLHTTP instance');
		return false;
	}
  
	http_request.onreadystatechange = alertContents;
	http_request.open('POST', url, true);
	http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http_request.setRequestHeader("Content-length", parameters.length);
	http_request.setRequestHeader("Connection", "close");
	http_request.send(parameters);
}

function alertContents() {
  if (http_request.readyState == 4) {
	if (http_request.status == 200) {
	 result = http_request.responseText;
	 var subSection = result.substring(3,0).toLowerCase();
	 var succes = (subSection == '<h2');
	 if (succes) {document.getElementById('formulier').innerHTML = '';document.getElementById('succes').innerHTML = result;}
	 else { document.getElementById('feedback').innerHTML = result; }
	} else {
	 document.getElementById('formulier').innerHTML = '';
	 document.getElementById('succes').innerHTML = '<h2 align="center" class="error">Er is een fout opgetreden.</h2><p align="center">Het formulier kan niet verzonden worden.</p>';
	}
  }
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function validateForm() {
  var i,p,nm,test,args=validateForm.arguments;
  for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
    if (val) {nm=val.name; if ((val=val.value)!="") {
		if (test.charAt(0) == 'R') document.form1.elements[nm].style.border = '1px solid #CCCCCC';
			if (test.indexOf('isEmail')!=-1) {
			  var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
			  if (filter.test(val)) {document.form1.elements[nm].style.border = '1px solid #CCCCCC';} else {document.form1.elements[nm].style.border = '1px solid #CC0000';}
			}
     	}
	 	else if (test.charAt(0) == 'R') document.form1.elements[nm].style.border = '1px solid #CC0000'; 
	}
  } 
}

function verstuur() {
	var poststr = "sender=" + escape(document.getElementById("sender").value) +
	"&onderwerp=" + escape(document.getElementById("onderwerp").value) + 
	"&over=" + escape(document.getElementById("over").value) + 
	"&toelichting=" + escape(document.getElementById("toelichting").value) + 
	"&kaartnummer=" + escape(document.getElementById("kaartnummer").value) + 
	"&email=" + escape(document.getElementById("email").value) + 
	"&voornaam=" + escape(document.getElementById("voornaam").value) + 
	"&achternaam=" + escape(document.getElementById("achternaam").value) + 
	"&postcode=" + escape(document.getElementById("postcode").value) + 
	"&huisnummer=" + escape(document.getElementById("huisnummer").value) + 
	"&huisnummertoevoeging=" + escape(document.getElementById("huisnummertoevoeging").value) + 
	"&straat=" + escape(document.getElementById("straat").value) + 
	"&plaats=" + escape(document.getElementById("plaats").value);
	makePOSTRequest('verstuur_contact.asp', poststr);
}