function validate_required( field, alerttxt )
{

  with ( field )
  {
    if ( value == null || value == "" )
    {
      alert( alerttxt );
      return false;
    }
    else {
      return true;
    }

  }

}

function validate_form(thisform)
{
  with ( thisform )
  {
    if ( validate_required( areacode, "Please enter a valid phone number." ) == false )
    {
      areacode.focus();
      return false;
    }
    else if ( validate_required( prefix, "Please enter a valid phone number." ) == false )
    {
      areacode.focus();
      return false;
    }
    else if ( validate_required( suffix, "Please enter a valid phone number." ) == false )
    {
      areacode.focus();
      return false;
    }
    else if ( validate_required( name, "Please enter your name." ) == false )
    {
      name.focus();
      return false;
    }


  }

}