function on1() 
{if (!document.images) return; document.a.src = "images/butt_presentation_sel.jpg";} 
function on2() 
{if (!document.images) return; document.b.src = "images/butt_lesymposium_sel.jpg";}
function on3() 
{if (!document.images) return; document.c.src = "images/butt_programme_sel.jpg";}
function on4() 
{if (!document.images) return; document.d.src = "images/butt_partenaires_sel.jpg";}
function on5() 
{if (!document.images) return; document.e.src = "images/butt_photos_sel.jpg";}
function on6() 
{if (!document.images) return; document.f.src = "images/butt_contact_sel.jpg";}
function on7() 
{if (!document.images) return; document.g.src = "images/butt_presse_sel.jpg";}
function on8() 
{if (!document.images) return; document.h.src = "images/butt_interventions_sel.jpg";}



function off1() 
{if (!document.images) return; document.a.src = "images/butt_presentation.jpg";}
function off2() 
{if (!document.images) return; document.b.src = "images/butt_lesymposium.jpg";}
function off3() 
{if (!document.images) return; document.c.src = "images/butt_programme.jpg";}
function off4() 
{if (!document.images) return; document.d.src = "images/butt_partenaires.jpg";}
function off5() 
{if (!document.images) return; document.e.src = "images/butt_photos.jpg";}
function off6() 
{if (!document.images) return; document.f.src = "images/butt_contact.jpg";}
function off7() 
{if (!document.images) return; document.g.src = "images/butt_presse.jpg";}
function off8() 
{if (!document.images) return; document.h.src = "images/butt_interventions.jpg";}

var imgslist = new Array(
"images/butt_presentation_sel.jpg",
"images/butt_photos_sel.jpg",
"images/butt_lesymposium_sel.jpg",
"images/butt_programme_sel.jpg",
"images/butt_partenaires_sel.jpg",
"images/butt_contact_sel.jpg", 
"images/butt_presse_sel.jpg",
"images/butt_interventions_sel.jpg");

var imgs=new Array(); 
for (x=0; x<imgslist.length; x++) 
 if (document.images) 
  {imgs[x]=new Image(); imgs[x].src = imgslist[x];}