function checkUser() {
var d = document.forms.contact;

   if (d.m_naam.value==""){
                alert('U bent vergeten om uw naam in te vullen!');
                d.m_naam.focus();
                return false;
 }
   if (d.m_email.value==""){
                alert('U bent vergeten om uw email adres in te vullen!');
                d.m_email.focus();
                return false;
 }
        if (!isEmail(d.m_email.value)){
                window.alert("Uw email adres is niet correct in gevuld!");
                d.m_email.focus();
                return false;
 }

}

function isEmail(str) {
  // are regular expressions supported?
  var supported = 0;
  if (window.RegExp) {
    var tempStr = "a";
    var tempReg = new RegExp(tempStr);
    if (tempReg.test(tempStr)) supported = 1;
  }
  if (!supported)
    return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
  var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
  var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
  return (!r1.test(str) && r2.test(str));
}


DOM = (document.getElementById) ? 1 : 0;
NS4 = (document.layers) ? 1 : 0;
Konqueror = (navigator.userAgent.indexOf("Konqueror") > -1) ? 1 : 0;
Konqueror22 = (navigator.userAgent.indexOf("Konqueror 2.2") > -1 || navigator.userAgent.indexOf("Konqueror/2.2") > -1) ? 1 : 0;
Opera = (navigator.userAgent.indexOf("Opera") > -1) ? 1 : 0;
Opera5 = (navigator.userAgent.indexOf("Opera 5") > -1 || navigator.userAgent.indexOf("Opera/5") > -1) ? 1 : 0;
Opera6 = (navigator.userAgent.indexOf("Opera 6") > -1 || navigator.userAgent.indexOf("Opera/6") > -1) ? 1 : 0;
Opera56 = Opera5 || Opera6;
IE = (navigator.userAgent.indexOf("MSIE") > -1) ? 1 : 0;
IE = IE && !Opera;
IE5 = IE && DOM;
IE4 = (document.all) ? 1 : 0;
IE4 = IE4 && IE && !DOM;

function setLMCookie(name, value) {
	document.cookie = name + "=" + value;
}

function getLMCookie(name) {
	foobar = document.cookie.split(name + "=");
	if (foobar.length < 2) {
		return null;
	}
	tempString = foobar[1];
	if (tempString.indexOf(";") == -1) {
		return tempString;
	}
	yafoobar = tempString.split(";");
	return yafoobar[0];
}
/*
function parseExpandString() {
	expandString = getLMCookie("expand");
	expand = new Array();
	if (expandString) {
		expanded = expandString.split("|");
		for (i=0; i<expanded.length-1; i++) {
			expand[expanded[i]] = 1;
		}
	}
}

function saveExpandString() {
	expandString = "";
	for (i=0; i<expand.length; i++) {
		if (expand[i] == 1) {
			expandString += i + "|";
		}
	}
	setLMCookie("expand", expandString);
}



function toggletreemenu(nodeid) {
	if ((!DOM || Opera56 || Konqueror22) && !IE4) {
		return;
	}

	if (!IE4) {
		nodeLayer = document.getElementById('nav' + nodeid);
	} else {
		nodeLayer = document.all('nav' + nodeid);
	}
	
	if (nodeLayer)
	{
	
		if (nodeLayer.parentNode.className == "closed") {
			nodeLayer.parentNode.className = "open";
			
			for (i=0; i<expand.length; i++) {
				if (expand[i] == 1) {
					toggletreemenu(i);
				}
			}
			
			expand[nodeid] = 1;
		} else {
			nodeLayer.parentNode.className = "closed";
			expand[nodeid] = 0;
		}
	}
	saveExpandString();
}

function expandtree()
{
	parseExpandString();
	
	for (i=0; i<expand.length; i++)
	{
		if (expand[i] == 1)
		{
			if (!IE4) nodeLayer = document.getElementById('nav' + i);
			else nodeLayer = document.all('nav' + i);
			
			if (nodeLayer)
			{
				if (nodeLayer.parentNode.className == "closed")
				{
					nodeLayer.parentNode.className = "open";
				}
				else
				{
					nodeLayer.parentNode.className = "closed";
				}
			}
		}
	}
	saveExpandString();

	// huilen ....
	var items = document.getElementById('nav').getElementsByTagName('li');
	for (i = 0; i < items.length; i++)
	{
		if (items[i].firstChild.id == 'subs')
		{
			if (items[i].parentNode.id != 'nav')
			{
				if (items[i].parentNode.parentNode.className == 'closed')
				{
					var nodeid = items[i].parentNode.id.replace('node', '');
					toggletreemenu(nodeid);
				}
			}
		}	
	}
}
*/
function ShowHideChildItems(listItem, state){
  if(listItem){
    if(listItem.tagName == "LI"){
      var item_id = listItem.id.substr(4);
      var child_ul = document.getElementById('subnavigatie'+item_id);
      var current_li = '';
      
      //collapse all items in corresponding menu
      var parent_node = listItem.parentNode;
      for(i=0;i<=parent_node.childNodes.length-1;i++){
        current_li = parent_node.childNodes[i];
        for(j=0;j<=current_li.childNodes.length-1;j++){
          if(current_li.childNodes[j].tagName == "UL"){
            current_li.childNodes[j].style.display = 'none'
          }
        }
      }
      
      if(typeof state != 'undefined'){
        if(state == 'block' || state == 'none'){
          child_ul.style.display = state;
        }
      }else{
        if(child_ul.style.display == '' || child_ul.style.display == 'block'){
          child_ul.style.display = 'none';
          return;
        }else{
          child_ul.style.display = 'block';
          return;
        }
      }
    }
  }
}

function calcPhcp(ehcp, par, sr, cr)
{
	phcp = ehcp * sr / 113 + cr - par;
	return phcp;
}

function calculate()
{
	// haal Exact handicap op
	tmp_ehcp = document.getElementById('ehcp').value;
	tmp_s = tmp_ehcp.replace(',','.');
	ehcp = new Number(tmp_s);
	
	// berekenen playing handicap
	hbt = Math.round(calcPhcp(ehcp, 72.0, 131, 73.5));
	hmt = Math.round(calcPhcp(ehcp, 72.0, 130, 72.6));
	dbt = Math.round(calcPhcp(ehcp, 72.0, 124, 74.9));
	dmt = Math.round(calcPhcp(ehcp, 72.0, 123, 74.0));

	// vul de velden
	document.getElementById('hbtphcp').value = hbt;
	document.getElementById('hmtphcp').value = hmt;
	document.getElementById('dbtphcp').value = dbt;
	document.getElementById('dmtphcp').value = dmt;
		
}

function NewWindow(mypage, myname, w, h, scroll) {
var winl = (screen.width - w) / 2 - 5;
var wint = (screen.height - h) / 2 - 15;
winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable=no, toolbar=no, location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=no'
win = window.open(mypage, myname, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}