yup, thanks a lot ...
it's better now as this :
<spot name="Chateau_de_Thenieres_112013" lat="46.303468" lng="6.325942" heading="200" active="true" onclick="hide_map();loadscene(Chateau_de_Thenieres_112013,null,BLEND(1))" />
<spot name="Saint_Jean_Daulps_122013" lat="46.234585" lng="6.655675" heading="200" active="true" onclick="hide_map();loadscene(Saint_Jean_Daulps_122013,null,BLEND(1))" />
<spot name="Port_Thonon_122013" lat="46.375440" lng="6.477814" heading="200" active="true" onclick="hide_map();loadscene(Port_Thonon_122013,null,BLEND(1))" />
<spot name="Chateau_Montjoux_122013" lat="46.3712657405864" lng="6.46697759628296" heading="200" active="true" onclick="hide_map();loadscene(Chateau_Montjoux_122013,null,BLEND(1))" />
</layer>
</layer>
</layer>
</layer>
<action name="hide_map">
set(layer[skin_map].visible,false);
</action>
But i have a strange thing now : I have like a veil on the view when the map disappears.
In fact i have to click a second time on the "earth" to have this veil disappeared.
you see it ?
http://www.lookit.org/vueduciel/vtour/