function externalLinks() { 
 if (!document.getElementsByTagName) return; 
 var anchors = document.getElementsByTagName("a"); 
 for (var i=0; i<anchors.length; i++) { 
   var anchor = anchors[i]; 
   if (anchor.getAttribute("href") && 
       anchor.getAttribute("rel") == "external") 
     anchor.target = "_blank"; 
 } 
} 


function ajax(url) {
	var httpObj = false;
		httpObj = window.XMLHttpRequest ? new window.XMLHttpRequest : (window.ActiveXObject ? new ActiveXObject("MSXML2.XMLHTTP"): null);
		httpObj.onreadystatechange = function() {
		if (httpObj.readyState == 4) {
			if(httpObj.responseText=="true"){
				return true;
			}
			else {
				return false;
			}
		}
	};
	httpObj.open('POST', url, true);
	httpObj.send(null);
}

function _dob() {
	document.getElementById('dob').value=document.getElementById('dag').value+'/'+document.getElementById('maand').value+'/'+document.getElementById('jaar').value;
	return true;
}