// JavaScript Document
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}


// Validate Forms
function validate_frm_wordvriend(){
	var email = document.frm_wordvriend.email;
	var naam = document.frm_wordvriend.naam;
	var errors = false;
	
	if (validate_required(naam)==false){		
		naam.focus();
		msg('naamerror','errormessage' , '* Verplicht');
		errors = true;
	}else{
		msg('naamerror','errormessage' , ' ');
	}
	
	if (validate_required(email)==false || echeck(email.value)==false ){
		email.focus();
		msg('emailerror','errormessage' , '* Fout in e-mailadres');
		errors = true;
	}else{
		msg('emailerror','errormessage' , ' ');
	}
	
	if(errors){
		return false;	
	}else{
		document.frm_wordvriend.submit();	
	}	
 } 
function validate_required(field){
	with (field){
		if (value==null||value==""){
			return false;
		}else{
			return true
		}
	}
}
/*** DHTML email validation script. */
function echeck(str) {
		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){		   
		   return false
		}
		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   return false
		}
		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    return false
		}
		 if (str.indexOf(at,(lat+1))!=-1){
		    return false
		 }
		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    return false
		 }
		 if (str.indexOf(dot,(lat+2))==-1){
		    return false
		 }		
		 if (str.indexOf(" ")!=-1){
		    return false
		 }
 		 return true					
	}

function msg(fld,     // id of element to display message in
             msgtype, // class to give element ("warn" or "error")
             message) // string to display
{
  // setting an empty string can give problems if later set to a 
  // non-empty string, so ensure a space present. (For Mozilla and Opera one could 
  // simply use a space, but IE demands something more, like a non-breaking space.)

 var dispmessage;
  if (message == "") 
    dispmessage = String.fromCharCode(nbsp);    
  else  
    dispmessage = message;
  document.getElementById(fld).innerHTML = dispmessage;
}


function toggleEventVisibility(eventID){
	var eventText = document.getElementById('ev_'+eventID )		
	if(eventText.style.display == "none"){	
		eventText.style.display = "";			
	}else{	
		eventText.style.display = "none";	
	}
}
function toggleArtikelVisibility(artID){
	var artikelText = document.getElementById('art_'+artID )		
	if(artikelText.style.display == "none"){	
		artikelText.style.display = "";			
	}else{	
		artikelText.style.display = "none";	
	}
}
function toggleWetenschappelijkOnderzoekVisibility(woID){
	var woText = document.getElementById('wo_'+woID )		
	if(woText.style.display == "none"){	
		woText.style.display = "";			
	}else{	
		woText.style.display = "none";	
	}
}	








//-->