 <!--
var agt=navigator.userAgent.toLowerCase();
var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1) && (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1));
var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);
var is_nav6up = (is_nav && (is_major >= 5));
var is_ie4up  = (is_ie && (is_major >= 4));
var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_ie4up  = (is_ie && (is_major >= 4));
var lastclicked = "none";

var pointcursor = "";
if(is_nav6up){pointcursor = "pointer";}
if(is_ie4up){pointcursor = "hand";}


  function get_browser_height(){
  
  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;
      }
    }
  }

  return(myHeight);
  
 }
 
function check_menu_over(div){
	div.className = "menu_over";
	div.style.cursor = pointcursor;
}

function check_menu_out(div){
		div.className = "menu_out";
}

/*
// functies voor het uitklapmenu
function hide_menu(){
	if(!mouse_on_submenu_01){
		document.getElementById('submenu_01').style.display = 'none';
	}
}

function check_submenu(){
	mouse_on_submenu_01 = false;
	setTimeout('hide_menu();',50); 
}


function check_click(page){
	document.location.href = "/pagina/"+page;
}

// deze functie wordt bij het inladen van een pagina aangeroepen en zorgt dat de juiste menu knop ingedrukt staat
function check_button(tdname){
	if (tdname!='none'){
		document.getElementById(tdname).className = "menu_over";
		lastclicked = document.getElementById(tdname);
	}
}

function openWin(file){
	myWin = window.open(file,"Popup","toolbar=no,status=no,width=250,height=400");
	myWin.moveTo(0,0);
}

 function get_browser_height(){
  
  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;
      }
    }
  }
  
  myHeight = myHeight - 30;
  return(myHeight);
  
 }

//*********************************************
// popup_full_picture
//*********************************************

function popup_full_picture(image_id,image_title){
	
	var popup_url = 'http://www.vjoj.nl/popup_picture.php?image_id=' + image_id + '&image_title=' + image_title;
	myWin=open(popup_url,"popup","width=50,height=50,toolbar=0,location=0,directories=0,resizable=0,scrollbars=0,status=0,screenX=0,screenY=0");
	
} // popup_full_picture

function openWin(file){

	myWin=window.open(file,"Popup","toolbar=no,status=no,width=250,height=400");
	myWin.moveTo(0,0);

}

function swap_check_value(checkbox){
	if(checkbox.value==0){
		checkbox.value=1;
	} else {
		checkbox.value=0;
	}
	
} // function swap_check_value

   //*********************************************
   // Form validatie script                    
   //*********************************************
           

function select_validation(entered, alertbox) {
 
	with(entered){
		if (value==null || value=="NULL" || value=="null"){
			if (alertbox!=""){
				alert(alertbox);
			}
			return false;
		} else {
			return true;
		}
	}
   
} // function select_validation

function value_validation(entered, min, max, alertbox, datatype) {
	with (entered){
		checkvalue=parseFloat(value);
		if (datatype){
			smalldatatype=datatype.toLowerCase();
			if (smalldatatype.charAt(0)=="i"){
				checkvalue=parseInt(value);
			}
		}
	
		if ((parseFloat(min)==min && checkvalue<min) || (parseFloat(max)==max && checkvalue>max) || value!=checkvalue){
			if (alertbox!=""){
				alert(alertbox);
			}
			return false;
		} else {
			return true;
		}
	}
} //function value_validation

function radio_validation(radiobuttons, alertbox){

	var ingevuld=false;
	for(teller=0;teller<radiobuttons.length;teller++){
		if(radiobuttons[teller].checked==true){
			ingevuld=true;
		}
	}
	
	if(ingevuld){
		return true;
	} else {
		if (alertbox!=""){
			alert(alertbox);
		}
	return false;
	}

} //  function radio_validation

function empty_validation(entered, alertbox){

	with(entered){
		if (value==null || value==""){
			if (alertbox!=""){
				alert(alertbox);
			}
			return false;
		} else {
			return true;
		}
	}
  
} // function emptyvalidation

function checkbox_validation(entered, alertbox){

	with(entered){
		if (checked==false){
			if (alertbox!=""){
				alert(alertbox);
			}
			return false;
		} else {
			return true;
		}
	}
  
} // function emptyvalidation

function email_validation(entered, alertbox) {

	with (entered) {
		apos=value.indexOf("@"); 
		dotpos=value.lastIndexOf(".");
		lastpos=value.length-1;
		if (apos<1 || dotpos-apos<2 || lastpos-dotpos>3 || lastpos-dotpos<2) {
			if (alertbox){
				alert(alertbox);
			}
			return false;
		} else {
			return true;
		}
	}
} // function email_validation


function telefoonnummer_validation(nummer_01,nummer_02){

	regionr=nummer_01.value;
	nummer=nummer_02.value;
	
	if(regionr+nummer!=""){
		if((regionr.length+nummer.length)!=10){
			alert("U dient een geldig telefoonnummer in te voeren");
			return false;
		} else {
			if(regionr=="06"){
				alert("Het is niet toegestaan mobiele nummers in te voeren");
				return false;
			}
		}   
	}

} // function telefoonnummer_validation

function length_validation(entered,min,max,alertbox){

	if(entered.value.length<=min){
		alert(alertbox);
		return false;
	}
	
	return true;
 
} // function length_validation

function stringtype_validation(str,alertbox){

	if(integer_validation(str.value)==true){
		alert(alertbox);
		return false;
	} else {
		return true;
	}
	
} // function stringtype_validation

function integer_validation (str){
	
	var i = parseInt (str);
	if (isNaN (i)){
		return false;
	}	
	
	i = i . toString ();
	if (i != str){
		return false;
	}	
	
	return true;

} //function integer_validation

//-->
*/