function bookmark(url, description)  {
var netscape="Netscape User's hit CTRL+D to add a bookmark to this site."
if (navigator.appName=='Microsoft Internet Explorer')  {
window.external.AddFavorite(url, description);
} else if (navigator.appName=='Netscape') {
alert(netscape);
 		}
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		header_05_over = newImage("/images/header_05-over.jpg");
		header_10_over = newImage("/images/header_10-over.jpg");
		header_11_over = newImage("/images/header_11-over.jpg");
		header_12_over = newImage("/images/header_12-over.jpg");
		header_13_over = newImage("/images/header_13-over.jpg");
		header_14_over = newImage("/images/header_14-over.jpg");
		preloadFlag = true;
	}
}

function chkemail (a) {
	
var reg1 = /(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)|( )/; 
var reg2 = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/; 

	if (!reg1.test(a.email.value) && reg2.test(a.email.value)) {
  	return true;
	} else {
	alert("Email adres " + a.email.value + " is geen geldig email adres!!");
  	a.email.focus();
  	return (false); 
 	}
return true;
}


function contact(a) {
document.getElementById("error").innerHTML="versturen van de aanmeld gegevens .. ";	
//encode post values
var data = encodePOST(a);
// all forms handled now post the request	
httpRequest("POST","/contact.php",true,handlecontact,data);	
return true;
}

function handlecontact() {
var regexp1 = /ERROR:/g;	
	if (request.readyState == 4) {
		if (request.status == 200) {
        if (request.responseText.match(regexp1)) {
			  document.getElementById("error").innerHTML=request.responseText;
		    } else {
			  document.getElementById("content").innerHTML=request.responseText;
        }
		  } else {
		  alert("problem with page returned " + request.status);
		}
	}
}