function checkform ( form )
{

  // ** START **
  if (form.bus_name.value == "") {
    alert( "Please enter your business name." );
    form.bus_name.focus();
    return false ;
  }

  if (form.contact_name.value == "") {
    alert( "Please enter the contact name." );
    form.contact_name.focus();
    return false ;
  }

  if (form.add1.value == "") {
    alert( "Please enter the 1st line of postal address." );
    form.add1.focus();
    return false ;
  }


  if (form.town.value == "") {
    alert( "Please enter the town your business is located." );
    form.town.focus();
    return false ;
  }


  if (form.county.value == "") {
    alert( "Please enter the county your business is located." );
    form.county.focus();
    return false ;
  }


  if (form.postcode.value == "") {
    alert( "Please enter your business postcode." );
    form.postcode.focus();
    return false ;
  }


if (form.tel.value == "")
  {
    alert( "Please enter your business telephone number." );
    form.tel.focus();
    return false ;
  }

// START confirm entry in tel field is a number and not a letter

  var digits = "0123456789 +";

  for (var i = 0; i < form.tel.value.length; i++)
  {
    temp = form.tel.value.substring(i, i+1)

    if (digits.indexOf(temp) == -1 &&
     form.tel.value != "")
    {
    alert( "You must enter a number in telephone number." );
    form.tel.focus();
    return false ;
    }
  }

// END confirm entry in tel field is a number and not a letter


if (form.email.value == "")
  {
    alert( "Please enter your business email address." );
    form.email.focus();
    return false ;
  }

// START confirm valid email address

if ((form.email.value.indexOf ('@',0) == -1 ||
   form.email.value.indexOf ('.',0) == -1) &&
   form.email.value != "")
  {
    alert( "The email address entered doesn’t seem to be valid." );
    form.email.focus();
    return false ;
  }

// END confirm valid email address


 if (form.no_employ.options[0].selected != ""){
    alert( "Please select the No of Employees." );
    form.no_employ.focus();
    return false ;
  }
  
  
 if (form.listing_type.options[0].selected != ""){
    alert( "Please select the listing type requested." );
    form.listing_type.focus();
    return false ;
  }




  // ** END **
  return true ;
}