function VF_verzenden(){ //v2.0
<!--start_of_saved_settings-->
<!--type,text,name,txtemail,required,true,isEmail,errMsg,Uw e-mail adres ontbreekt of deze is niet juist-->
<!--type,text,name,txttelefoon,required,true,errMsg,Uw telefoonnummer ontbreekt-->
<!--type,text,name,txtnaam,required,true,errMsg,Uw naam ontbreekt-->
<!--end_of_saved_settings-->
	var theForm = document.verzenden;
	var emailRE = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/;
	var errMsg = "";
	var setfocus = "";

	if (!emailRE.test(theForm['txtemail'].value)){
		errMsg = "Uw e\-mail adres ontbreekt of deze is niet juist";
		setfocus = "['txtemail']";
	}
	if (theForm['txttelefoon'].value == ""){
		errMsg = "Uw telefoonnummer ontbreekt";
		setfocus = "['txttelefoon']";
	}
	if (theForm['txtnaam'].value == ""){
		errMsg = "Uw naam ontbreekt";
		setfocus = "['txtnaam']";
	}
	if (errMsg != ""){
		alert(errMsg);
		eval("theForm" + setfocus + ".focus()");
	}
	else theForm.submit();
}
<!--
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];}
}
//-->