<!--
function checkFormwazzup(){
var checkvelden = new Array();
var melding = '';
checkvelden[0] = "naam";
checkvelden[1] = "emailadres";
checkvelden[2] = "adres";
checkvelden[3] = "postcode";
checkvelden[4] = "plaats";

if (document.form1.elements[checkvelden[0]].value == '' || document.form1.elements[checkvelden[1]].value == '') {
	melding = 'Naam en/of emaildres ontbreekt!';
	alert (melding);
	return false;
}
if (document.form1.elements[checkvelden[2]].value == '' && document.form1.elements[checkvelden[3]].value == '' && document.form1.elements[checkvelden[4]].value == '') {
}
else {
	if (document.form1.elements[checkvelden[2]].value == '' || document.form1.elements[checkvelden[3]].value == '' || document.form1.elements[checkvelden[4]].value == '') {
		melding = 'adres en/of postcode en/of plaats ontbreken!';
		alert (melding);
		return false;
	}
}
return true;
}

function checkFormemail()
{
var checkvelden = new Array();
var melding = '';
checkvelden[0] = "emailadresoud";
checkvelden[1] = "emailadresnieuw";
for (i=0; i<checkvelden.length; i++)
{
	if (document.form1.elements[checkvelden[i]].value == '' || document.form1.elements[checkvelden[i]].value == 'emailadres-oud' || document.form1.elements[checkvelden[i]].value == 'emailadres-nieuw')
	{
		if (melding=='')
		{
			melding = checkvelden[i];
		}
		else
		{
			melding += (', ' + checkvelden[i]);
		}
	}
}
if (melding=='')
{
	return true;
}
else
{
	melding = 'De volgende velden nog invullen svp:\n' + melding;
	alert (melding);
	return false;
}
}

function checkFormnaam()
{
var checkvelden = new Array();
var melding = '';
checkvelden[0] = "naam";
checkvelden[1] = "emailadres";
for (i=0; i<checkvelden.length; i++)
{
	if (document.form1.elements[checkvelden[i]].value == '' || document.form1.elements[checkvelden[i]].value == 'naam nieuw' || document.form1.elements[checkvelden[i]].value == 'emailadres')
	{
		if (melding=='')
		{
			melding = checkvelden[i];
		}
		else
		{
			melding += (', ' + checkvelden[i]);
		}
	}
}
if (melding=='')
{
	return true;
}
else
{
	melding = 'De volgende velden nog invullen svp:\n' + melding;
	alert (melding);
	return false;
}
}


function veld_zetwaarde(fnaam, vnaam) 
{
  document.forms[fnaam].elements[vnaam].value = '';
}


function na_email_validation(fname, type_name, str) 
{
  var email_validation = true
  var temp = document.forms[fname].elements[type_name]
  var at = temp.value.indexOf('@')
  var prd = temp.value.lastIndexOf('.')
  var space = temp.value.indexOf(' ')
  var length = temp.value.length - 1   
  if (temp.value == '') {
	return true
  }	
  if ((at < 1) || (prd <= at+1) ||  (prd == length ) ||  (space  != -1)) {  
    email_validation = false
    alert(str)
    temp.focus()
  }
  return email_validation
}

function resizeDiv() {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }

document.getElementById('main').style.height = myHeight - 205;
document.getElementById('menu').style.height = myHeight - 205;
}

function nieuwvenster(pdf) {
	window.open(pdf, "");
}

var win=null;
function NewWindow(mypage,myname,w,h,scroll,pos){
if(pos=="random"){LeftPosition=(screen.width)?Math.floor(Math.random()*(screen.width-w)):100;TopPosition=(screen.height)?Math.floor(Math.random()*((screen.height-h)-75)):100;}
if(pos=="center"){LeftPosition=(screen.width)?(screen.width-w)/2:100;TopPosition=(screen.height)?(screen.height-h)/2:100;}
else if((pos!="center" && pos!="random") || pos==null){LeftPosition=0;TopPosition=20}
settings='width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
win=window.open(mypage,myname,settings);}

function berbft(knopen) {
    if (knopen.knoopf.value<0) window.alert("Wind is niet negatief dan komt ie van de ander kant.")
   else if (knopen.knoopf.value<1) knopen.bftf.value=0
   else if (knopen.knoopf.value<=3) knopen.bftf.value=1
   else if (knopen.knoopf.value<=6) knopen.bftf.value=2
   else if (knopen.knoopf.value<=10) knopen.bftf.value=3
   else if (knopen.knoopf.value<=16) knopen.bftf.value=4
   else if (knopen.knoopf.value<=21) knopen.bftf.value=5
   else if (knopen.knoopf.value<=27) knopen.bftf.value=6
   else if (knopen.knoopf.value<=33) knopen.bftf.value=7
   else if (knopen.knoopf.value<=40) knopen.bftf.value=8
   else if (knopen.knoopf.value<=47) knopen.bftf.value=9
   else if (knopen.knoopf.value<=55) knopen.bftf.value=10
   else if (knopen.knoopf.value<=63) knopen.bftf.value=11
   else if (knopen.knoopf.value>63) knopen.bftf.value=12
}

function fbft(display) {
  var i=eval(display.bftf.value)
  if ((i<0) || (i>12)) window.alert("Die windkracht bestaat niet!")
  else {
   if (i==0) display.knoopf.value=0
   if (i==1) display.knoopf.value=2
   if (i==2) display.knoopf.value=4
   if (i==3) display.knoopf.value=8
   if (i==4) display.knoopf.value=13
   if (i==5) display.knoopf.value=18
   if (i==6) display.knoopf.value=25
   if (i==7) display.knoopf.value=30
   if (i==8) display.knoopf.value=36
   if (i==9) display.knoopf.value=44
   if (i==10) display.knoopf.value=52
   if (i==12) display.knoopf.value=70
   if (i==11) display.knoopf.value=59
     
   display.kmhf.value=display.knoopf.value*1.852
   display.m_sf.value=display.kmhf.value/3.6
   display.bftf.value=i
 }
}

function fkmh(display) {
    display.kmhf.value = eval(display.kmhf.value)
    display.knoopf.value = display.kmhf.value/1.852;
    display.m_sf.value = display.kmhf.value/3.6;
    berbft(display)
}

function fms(display) {
  display.m_sf.value = eval(display.m_sf.value)
  display.kmhf.value = display.m_sf.value*3.6
  display.knoopf.value = display.kmhf.value/1.852
  berbft(display)
}

function fknoop(display) {
  display.knoopf.value= eval(display.knoopf.value)
  display.kmhf.value = display.knoopf.value*1.852
  display.m_sf.value = display.kmhf.value*1000/3.6/1000
  berbft(display)
}

function berekenWat(display) {
        if (display.bftf.value != "") fbft(display)
        else if (display.knoopf.value != "") fknoop(display)
        else if (display.kmhf.value != "") fkmh(display)
        else if (display.m_sf.value != "") fms(display)
}
        
function clrform(display)
{
         display.knoopf.value =""
         display.bftf.value =""
         display.m_sf.value =""
         display.kmhf.value =""
}
// -->