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,ia=MM_preloadImages.arguments; for(i=0; ia.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&&id.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 preloadImages() {
  var d=document; if(d.images){ if(!d.p) d.p=new Array();
    var i,j=d.p.length,a=preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.p[j]=new Image; d.p[j++].src=a[i];}}
}

function swap(imagename,objectsrc)
	{
	var n=navigator.appName
	var v=parseInt(navigator.appVersion)
        var browsok=((n=="Netscape")&&(v>=3))
        var browsok2=((n=="Microsoft Internet Explorer")&&(v>=4))
        if ((browsok)||(browsok2))
       	//document.images[imagename].src=eval(objectsrc+".src");
       	document.getElementById[imagename].src=eval(objectsrc+".src");
}

function swapSpecial(imagename,objectsrc)
	{
	document.getElementById("kaart").style.display = "none";
	var n=navigator.appName
	var v=parseInt(navigator.appVersion)
        var browsok=((n=="Netscape")&&(v>=3))
        var browsok2=((n=="Microsoft Internet Explorer")&&(v>=4))
        if ((browsok)||(browsok2))
       	document.images[imagename].src=eval(objectsrc+".src");
}

function LTrim(str) {
	if (str.length == 0) {return str};
	intSpaceFound = str.indexOf(" ");
	while (intSpaceFound == 0 ) {
		str = str.substring(1,str.length);
		intSpaceFound = str.indexOf(" ");
	}	
	return str;
}

function RTrim(str) {
	if (str.length == 0) {return str};
	intSpaceFound = str.lastIndexOf(" ");
	while (intSpaceFound > 0 && intSpaceFound == str.length - 1) {
		str = str.substring(0,str.length - 1);
		intSpaceFound = str.lastIndexOf(" ");
	}	
	return str;
}

function Trim(str) {
	str = LTrim(str);
	str = RTrim(str);
	return str;
}


function show(ima, nr){
	for (i=0;i<nr;i++){
		document.getElementById(i).style.display = "none";
	}
	document.getElementById(ima).style.display = "";
}


function checkForm(){

	if (document.forms[0].naam.value==""){
		alert('Vul uw naam in');
		document.forms[0].naam.focus();
		return false;
	}

	if (document.forms[0].email.value==""){
		alert ('Vul uw e-mail adres in');
		document.forms[0].email.focus();
		return false;
	}else{
		if (!emailadrescheck(document.forms[0].email.value)){
			alert('Vul een geldig e-mail adres in');
			document.forms[0].email.focus();
			return false;
		}

	}

	if (document.forms[0].bericht.value==""){
		alert('Geeft u a.u.b. aan waarover u contact met ons op wilt nemen');
		document.forms[0].bericht.focus();
		return false;
	}

	return true;
}



function emailadrescheck(temp){
	
	var AtSym    = temp.indexOf('@');
	var Period   = temp.lastIndexOf('.')
	var Space    = temp.indexOf(' ')
	var Length   = temp.length - 1   // Array is from 0 to length-1

	if ((AtSym < 1) ||                  // '@' cannot be in first position
	(Period <= AtSym+2) ||            // Must be atleast one valid char btwn '@' and '.'
	(Period == Length ) ||            // Must be atleast one valid char after '.'
	(Space  != -1))                   // No empty spaces permitted
	{
		return false;
	}
	return true;

}

function checkFormNieuwstip(){

	if (document.forms[0].naam.value==""){
		alert('Vul uw naam in');
		document.forms[0].naam.focus();
		return false;
	}

	if (document.forms[0].email.value==""){
		alert ('Vul uw e-mail adres in');
		document.forms[0].email.focus();
		return false;
	}else{
		if (!emailadrescheck(document.forms[0].email.value)){
			alert('Vul een geldig e-mail adres in');
			document.forms[0].email.focus();
			return false;
		}

	}

	if (document.forms[0].onderwerp.value==""){
		alert('Geeft u a.u.b. in het kort uw nieuwstip in');
		document.forms[0].onderwerp.focus();
		return false;
	}

	return true;
}