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];}
}

function validate(frm){
	if(!frm.required) return true;
	var requiredFields = frm.required.value.split(/\s*,\s*/);;
	var rLen = requiredFields.length;
	if(frm.message)var message =  frm.message.value;
	if (!frm.message)message = 'De volgende velden zijn verplicht:';
	var errorFields = '';
	var firstFld = '';

	for(var i=0; i < rLen;i ++){
		var fldObj = eval('frm.' + requiredFields[i]);
		//value fields
		if (fldObj.value == '')errorFields += '- ' + fldObj.title + '\n';
		if(firstFld =='' && fldObj.value == '')firstFld = fldObj;
		//mail fields (name must contain 'mail')
		if(fldObj.name.toLowerCase().indexOf('mail') > -1)if(fldObj.value != '')if(!IsEmail(fldObj.value))errorFields += '- ' + fldObj.title + ' is ongeldig\n';
	}
	//custom func?
	if(frm.custom){
		errorFields += eval(frm.custom.value);
	}
	if(message != '') message += '\n';
	if(errorFields != ''){
		alert(message + errorFields);
		if(firstFld != '')firstFld.focus();
		return false;
	}
	return true;
}

function IsEmail(strEmail){
	var emailReg    = /^[A-Za-z0-9](([_\.\-]?[a-zA-Z0-9]+)*)@([A-Za-z0-9]+)(([\.\-]?[a-zA-Z0-9]+)*)\.([A-Za-z]{2,})$/;
	if(!strEmail.match(emailReg)){
		return false;
	}
	return true;
}