function validate(theForm) {
 if (form1.realname.value == "") {
  alert("Fill in your name please.");
  form1.realname.focus();
  return (false);
 }
 if (form1.email.value == "") {
  alert("Fill in your email address please.");
  form1.email.focus();
  return (false);
 }
 return (true);
}

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 validater() { if ((document.getElementById('realname').value == "") || (document.getElementById('realname').value == " ")) { alert("Vul uw naam in."); document.getElementById('realname').focus(); return (false); }if ((document.getElementById('email').value == "") || (document.getElementById('email').value == " ")) { alert("Vul uw emailadres in."); document.getElementById('email').focus(); return (false); }return (true); }
function textfocus(obj) { obj.style.backgroundImage = ''; }
function textblur(obj,image) { if (obj.value == '') { obj.style.background = '#FFFFFF url(' + image + ') no-repeat left center'; }}
function starten() {
 var emailadres = document.getElementById('emailadres');
 if (emailadres != null) { textblur(document.getElementById('emailadres'),'http://www.watergas.nu/images/form_email.gif'); }
 var gebruikersnaam = document.getElementById('gebruikersnaam');
 if (gebruikersnaam != null) { textblur(document.getElementById('gebruikersnaam'),'http://www.watergas.nu/images/form_inlognaam.gif'); }
 var wachtwoord = document.getElementById('wachtwoord');
 if (wachtwoord != null) { textblur(document.getElementById('wachtwoord'),'http://www.watergas.nu/images/form_wachtwoord.gif'); }
 var nieuwsbrief = document.getElementById('nieuwsbrief');
 if (nieuwsbrief != null) { textblur(document.getElementById('nieuwsbrief'),'http://www.watergas.nu/images/form_email.gif'); }

 var realname = document.getElementById('realname');
 if (realname != null) { textblur(document.getElementById('realname'),'http://www.watergas.nu/images/form_naam.gif'); }
 var subject = document.getElementById('subject');
 if (subject != null) { textblur(document.getElementById('subject'),'http://www.watergas.nu/images/form_onderwerp.gif'); }
 var email = document.getElementById('email');
 if (email != null) { textblur(document.getElementById('email'),'http://www.watergas.nu/images/form_email.gif'); }
 var adres = document.getElementById('adres');
 if (adres != null) { textblur(document.getElementById('adres'),'http://www.watergas.nu/images/form_woonplaats.gif'); }
 var opmerking = document.getElementById('opmerking');
 if (opmerking != null) { textblur(document.getElementById('opmerking'),'http://www.watergas.nu/images/form_vraag.gif'); }
}