var focussed = false;

function focus(field)
{
  if(!focussed)
  {
    field.focus()
    focussed = true;
  }
}

function validateForm(form)
{
  var msg = "";
  focussed = false;

  if(!/\w{2}/.test(form.name.value))
  {
    msg += "Your name\n";
    focus(form.name);
  }
  if(!/\w{3}/.test(form.address.value))
  {
    msg += "Your address\n";
    focus(form.address);
  }
  if(!/\w{3}/.test(form.postcode.value))
  {
    msg += "Your postcode\n";
    focus(form.postcode);
  }
  if(!/\d{5}/.test(form.homeTelephone.value) && !/\d{5}/.test(form.mobileTelephone.value))
  {
    msg += "Your telephone number\n";
    focus(form.homeTelephone);
  }
  if(!/\w{3}/.test(form.occupation.value))
  {
    msg += "Your present occupation\n";
    focus(form.occupation);
  }
  if(!(form.newspaper.checked
    || form.flyer.checked
    || form.friend.checked
    || form.carSign.checked
    || form.shopWindow.checked
    || form.businessCard.checked
    || form.other.value !== ""))
  {
    msg+="How you found out about this site";
    focus(form.other);
  }
  if(msg === "")
  {
    return true;
  }
  else alert("Please enter the following details:\n\n"+msg+"\n\nFree information will only be sent to serious applicants who send their full details.\n\nBe assured you will not be entered onto any mailing list.");
  return false;
}