function chkForm(frm) {
  // the name of the form
  f = frm;

  // change msg to the name of any field you want to make required.
  if (f.town) {
    if (f.town.value == '') {
      alert('Have you entered a valid town?');
      return false;
    }
  }
  
  if (f.county) {
    if (f.county.value == '') {
      alert('Have you entered a valid county?');
      return false;
    }
  }
  
  if (f.vfamilyname) {
    if (f.vfamilyname.value == '') {
      alert('Have you entered your name?');
      return false;
    }
  }
  
  if (f.telephone) {
    if (f.telephone.value == '') {
      alert('Have you completed your telephone number?');
      return false;
    }
  }
  
  if (f.houseno) {
    if (f.houseno.value == '') {
      alert('Have you entered a house number?');
      return false;
    }
  }
  
  if (f.street) {
    if (f.street.value == '') {
      alert('Have you entered your street name?');
      return false;
    }
  }
  
  if (f.vfamilytown) {
    if (f.vfamilytown.value == '') {
      alert('Have you entered a valid town?');
      return false;
    }
  }
  
  if (f.name) {
    if (f.name.value == '') {
      alert('Have you entered your name?');
      return false;
    }
  }
  
    if (f.postcode) {
    if (f.postcode.value == '') {
      alert('Have you entered your postcode?');
      return false;
    }
  }

  // if 'from' address field is used, this checks it to make sure address is valid
  if (f.email) {
    if (f.email.value != '' && (f.email.value.lastIndexOf('.') < 0 || f.email.value.lastIndexOf('@') < 1)) {
      alert('Invalid e-mail address');
      return false;
    }
    else if (f.email.value == '') {
      return confirm('Are you sure you want to send this message without an email address?');
    }
  }
}
//ROLLOVERS
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 MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}