openerp - Display a simple message box -

how display simple message box inside method of button @ user click.

when user click on button see message box.

i have add small method in .py file , generate message box on button click

xml file

<record id="view_hr_payroll_payslip_wizard" model="ir.ui.view">     <field name="name">hr.payroll.payslip.wizards</field>     <field name="model">hr.payroll.payslip.wizard</field>     <field name="type">form</field>     <field name="arch" type="xml">     <form string="moves" version="7.0">          <footer>             <button  name="generate_msg" string="click me" type="object" class="oe_highlight"/>or          </footer>     </form>     </field> </record> 

same name of method define in button name attribute in .py file

from openerp.tools.translate import _  def generate_msg(self, cr, uid, ids, context=none):     raise osv.except_osv(_("warning!"), _(" hello mehdi mokni !!.")) 

python library can added covert message in language

i hope should helpful ..:)