var req = createXMLHttpRequest();

function createXMLHttpRequest() {
 var ua;
 if(window.XMLHttpRequest) {
 try {
  ua = new XMLHttpRequest();
 } catch(e) {
  ua = false;
 }
 } else if(window.ActiveXObject) {
  try {
	ua = new ActiveXObject("Microsoft.XMLHTTP");
  } catch(e) {
	ua = false;
  }
 }
return ua;
}

function sendRequest(frm, file, button) {
 button.disabled=true;
 var rnd982g = Math.random();
 var str = "";
 if(str = getForm(frm)) {
  req.open('GET', file+'?'+str+'&rnd982g='+rnd982g);
  req.onreadystatechange = handleResponse;
  req.send(null);
 }
 button.disabled=false;
 return false;
}

function handleResponse() {
 if(req.readyState == 4){
  var response = req.responseText;
  document.getElementById("results").innerHTML = response;
 }
}


function getDate()
{
alert("getting date...");
var d = new Date();
var s = d.toLocaleString();
alert(s);
return s;
}
function setDate()
{
alert("Setting date");
document.getElementById("myDate").value = getDate();
}



function getForm(fobj) {
 var str = "";
 var ft = "";
 var fv = "";
 var fn = "";
 var els = "";
 for(var i = 0;i < fobj.elements.length;i++) {
  els = fobj.elements[i];
  ft = els.title;
  fv = els.value;
  fn = els.name;
 switch(els.type) {
  case "text":
  case "hidden":
  case "password":
  case "textarea":
  // is it a required field?
  if(encodeURI(ft) == "required" && encodeURI(fv).length < 1) {
	alert('\''+fn+'\' is een verplicht veld, gelieve in te vullen.');
	els.focus();
	return false;
  }
  if(fn=='email'){
	  if(!validateEmail(fv)){
		  alert('Gelieve een geldig e-mail adres op te geven.');
		  return false;		  
	  }
  }
  str += fn + "=" + encodeURI(fv) + "&";
  break; 

  case "checkbox":
  case "radio":
   if(els.checked) str += fn + "=" + encodeURI(fv) + "&";
  break;	

  case "select-one":
	str += fn + "=" +
	els.options[els.selectedIndex].value + "&";
  break;
  } // switch
 } // for
 str = str.substr(0,(str.length - 1));
 return str;
}

function validateEmail(elementValue){      
	var emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
	return emailPattern.test(elementValue); 
}