function validate_form ( )
{
    valid = true;

    if ( document.empl_form.contactName.value == "" )
    {
        alert ( "Please fill in the 'Your Name' box." );
        valid = false;
    }
	 if ( document.empl_form.contactMail.value == "" )
    {
        alert ( "Please fill in the 'E-mail address' box." );
        valid = false;
    }
	 if ( document.empl_form.contactSubject.value == "" )
    {
        alert ( "Please fill in the 'Subject' box." );
        valid = false;
    }
	 if ( document.empl_form.contactText.value == "" )
    {
        alert ( "Please fill in the 'Message' box." );
        valid = false;
    }

    return valid;
}