function checkform ( form )
{
  // ** START **
  if (form.yourname.value == "") {
    alert( "Please enter your name." );
    form.yourname.focus();
    return false ;
  }
  // ** END **
  // ** START **
  if (form.emailaddress.value == "") {
    alert( "Please enter your email address." );
    form.emailaddress.focus();
    return false ;
  }
  // ** END **
  // ** START **
  if (form.company.value == "") {
    alert( "Please enter your company." );
    form.company.focus();
    return false ;
  }
  // ** END **
  // ** START **
  if (form.companytype.value == "select") {
    alert( "Please enter your company type." );
    form.companytype.focus();
    return false ;
  }
  // ** END **
  return true ;
}