var bV=parseInt(navigator.appVersion);
NS4=(document.layers) ? true : false;
IE4=((document.all)&&(bV>=4))?true:false;
ver4 = (NS4 || IE4) ? true : false;

/**
 * Show date and time on the page.
 *
 * Called onload of page.
 * 
 * @author R.J.T. de Vries <rdevries@thirdwave.nl>
 */
function clock() {

	var maanden = new Array("januari","februari","maart","april","mei","juni","juli","augustus","september","oktober","november","december");

	var weekdagen = new Array("zondag","maandag","dinsdag","woensdag","donderdag","vrijdag","zaterdag");
	
	var time = new Date();
	
	var jaar = time.getYear();
	
	var jaar = (jaar < 1000) ? jaar + 1900 : jaar;

	var maand = time.getMonth();
	
	var dag = time.getDate();
	
	var weekdag = time.getDay();
	
	var uur = time.getHours();
	
	var minuut = time.getMinutes();
	
	var secondes = time.getSeconds();
	
	if ( uur <= 9 ) uur = "0" + uur;

	if ( minuut <= 9 ) minuut = "0" + minuut;

	if ( secondes <= 9 ) secondes = "0" + secondes;
	
	// set the string with date and time.
	
	var d = dag + " " + maanden[maand] + " " + jaar + " | " + uur  + ":" + minuut + "     ";

	document.getElementById('TIMER').innerHTML = d;
	
	// refresh this thing each second.
	
	setTimeout("clock()", 1000);

} // clock()

function checkInput(field) {
	var tmp = "";
	tmp += "if (document.form." + field + ".value == '') {\n";
   tmp += " leeg = 1;\n";
	tmp += " document.form." + field + ".focus()\n";
	tmp += "} else {\n";
	tmp += " leeg = 0;\n";
	tmp += "}\n";
	eval (tmp);
	
	if (leeg) {
		return false;
	} else {
		return true;
	}
}

function checkFields() {
	fields = Array("naam", "voorletters", "gebdatumdag", "gebdatummaand", "gebdatumjaar",
						"woonplaats", "telefoonnummer", "email");
	for (i = 0; i < fields.length; i++) {
		if (!checkInput(fields[i])) {
			alert ("Vul s.v.p. alle verplichte velden in.");
			return false;
		}
	}
}