function correctPNG() // correctly handle PNG transparency in Win IE 5.5 or higher.
{
	for(var i=0; i<document.images.length; i++)
   	{
		var img = document.images[i]
	  	var imgName = img.src.toUpperCase()
	  	if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
	    {
			var imgID = (img.id) ? "id='" + img.id + "' " : ""
		 	var imgClass = (img.className) ? "class='" + img.className + "' " : ""
		 	var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
		 	var imgStyle = "display:inline-block;" + img.style.cssText 
		 	if (img.align == "left") imgStyle = "float:left;" + imgStyle
		 	if (img.align == "right") imgStyle = "float:right;" + imgStyle
		 	if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle		
			var strNewHTML = "<img src='images/spacer.gif' border='0' " + imgID + imgClass + imgTitle
			strNewHTML += " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
			strNewHTML += "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
			strNewHTML += "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>"
			img.outerHTML = strNewHTML
		 	i = i-1
		}
	}
}
//window.attachEvent("onload", correctPNG);

function bepaalpositie(tabel_id, positielinks) {
	var tabel_id
	var positielinks
	
	breedte = document.getElementById(tabel_id).offsetWidth;

	//positielinks = positielinks

	positielinks_int = positielinks / 1;
	breedte_int = breedte / 1;

	totalebreedte = positielinks_int + breedte_int;

//alert(breedte)
	if (navigator.appName == "Microsoft Internet Explorer") {
		//Internet Explorer
		if (totalebreedte >= 780) {
			//te breed
			document.getElementById(tabel_id).style.marginLeft = (780-breedte_int);
		}
		else {
			document.getElementById(tabel_id).style.marginLeft = positielinks
		}
	} else {
		//geen IE
		if (totalebreedte >= 780) {
			//te breed
			document.getElementById(tabel_id).style.marginLeft = (779-breedte_int);
		}
		else {
			document.getElementById(tabel_id).style.marginLeft = positielinks
		}
	}
}

function plaatsmenu() { 
	bepaalpositie("table_wat_kunnen_wij", 320); 
	bepaalpositie("table_contact", 512);
}

function HideAllLayers() {
	MM_showHideLayers('menu_wat_kunnen_wij','','hide'); 
	MM_showHideLayers('menu_contact','','hide'); 
}

function MM_goToURL() { //v3.0
  var i, args=MM_goToURL.arguments; document.MM_returnValue = false;
  for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");
}

function changeStyle (what , how) {
  	what.className = how;
}

function changeStyle2 (what , how) {
  	document.getElementById(what).className = how;
}

function MM_showHideLayers() { //v6.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}

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_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_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];}
}

function containsDOM (container, containee) {
	var isParent = false;
	do {
		if ((isParent = container == containee))
		break;
		containee = containee.parentNode;
	}
	while (containee != null);
	return isParent;
}

function checkMouseEnter (element, evt) {
	if (element.contains && evt.fromElement) {
		return !element.contains(evt.fromElement);
	}
	else if (evt.relatedTarget) {
		return !containsDOM(element, evt.relatedTarget);
	}
}

function checkMouseLeave (element, evt) {
	if (element.contains && evt.toElement) {
		return !element.contains(evt.toElement);
	}
	else if (evt.relatedTarget) {
		return !containsDOM(element, evt.relatedTarget);
	}
}

/*
function resetimages() {
	document.getElementById("img_menu1").src = "images/menu_graafschap_running.gif"
	document.getElementById("img_menu2").src = "images/menu_onze_missie.gif"
	document.getElementById("img_menu3").src = "images/menu_onze_sponsors.gif"
	document.getElementById("img_menu4").src = "images/menu_de_marathon.gif"
	document.getElementById("img_menu5").src = "images/menu_deelname.gif"
	document.getElementById("img_menu6").src = "images/menu_nieuws.gif"
	document.getElementById("img_menu7").src = "images/menu_tips.gif"
	document.getElementById("img_menu8").src = "images/menu_contact.gif"
	document.getElementById("img_menu9").src = "images/menu_agenda.gif"		
	document.getElementById("img_menu11").src = "images/menu_home.gif"		
}
*/

function checkboxValidate()
{
	var maakkeuze = Validatemaakkeuze(form1);
	if (maakkeuze == false)
	{
		return false
	}
	else
	{
		return true
	}
}

function Validatemaakkeuze(theForm) 
{
	gemaaktekeuze = form1.hoe_gevonden[form1.hoe_gevonden.selectedIndex].value
	if (gemaaktekeuze == "0") {
		alert('Geef aan hoe u ons gevonden heeft.')
		return false
	} else {
		return true
	}
}

function MM_validateForm() { //v4.0
  var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
  for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
    if (val) { nm=val.name; if ((val=val.value)!="") {
      if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
        if (p<1 || p==(val.length-1)) errors+='- '+nm+' moet een geldig emailadres bevatten.\n';
      } else if (test!='R') { num = parseFloat(val);
        if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
        if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
          min=test.substring(8,p); max=test.substring(p+1);
          if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
    } } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is verplicht.\n'; }
  } if (errors) alert('De volgende velden zijn verplicht:\n'+errors);
  document.MM_returnValue = (errors == '');
}

var newwindow = null; function popup(plaatje, breedte, hoogte)
{
	breedte = parseInt(breedte) + 40
	hoogte = parseInt(hoogte) + 50

	if (newwindow) {
		newwindow.close();
	}

	URL = 'foto_popup.asp?plaatje=' + plaatje;
	features = 'top=50, left=50, width='+ breedte +', height='+ hoogte +''
	newwindow = window.open(URL,'Foto_Uitvergroting', features );
}