function validate_form ( )
{
    valid = true;

    if ( document.contact_form.name.value == "" )
    {
        alert ( "Please fill your Name." );
        valid = false;
    }
	 if ( document.contact_form.email.value == "" )
    {
        alert ( "Please fill your Email." );
        valid = false;
    }
	 if ( document.contact_form.phone.value == "" )
    {
        alert ( "Please fill your Phone." );
        valid = false;
    }
	
    return valid;
}