function ValidateForm1(){	
			var flag = true;
			var message = 'Gelieve alle verplichten velden in te vullen';
			
			if(http.readyState == 4)	{
				var showcheck = http.responseText;
				if (showcheck=='0') {
					message = 'Onjuste verificatie code';
				  	flag = false;
				};
				
						
			if (document.ContactForm1.field1.value.length==0){
			  	flag = false;
			}; 
			
			if (document.ContactForm1.field2.value.length==0){
			  	flag = false;
			}; 
			
			if (document.ContactForm1.field3.value.length==0){
			  	flag = false;
			}; 
		
			if (flag == false) {
				alert(message);
			} else {
				document.ContactForm1.submit();
			};
					
			};
			
		};function createRequestObject(){
	try	{
		xmlhttp = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
	}	catch(e)	{
		alert('Sorry, je brouser ondersteunt geen XML Http Request.');
	};
	return xmlhttp;
};

var http = createRequestObject();

function CheckForm1() {
	var captchacheck = document.ContactForm1.captchacode.value;
	var url = '/formphp/captcha-uitvoer.php?captcha=' + captchacheck;
	http.open('GET', url, true);
	http.onreadystatechange = ValidateForm1;
	http.send(null);
};