function preload() { 
   nb_arguments = preload.arguments.length; 
   if (nb_arguments > 0) { 
       var img_load = new Array(); 
       for (var i=0; i<nb_arguments; i++) { 
           img_load[i+1] = new Image(); 
           img_load[i+1].src = preload.arguments[i]; 
       } 
   } 
} 
 
preload("images/btn-valider-over.gif"); 
preload("images/bt-pageperso2.gif");  
preload("images/btn-partager-on.gif");  
preload("images/btn-inscription2.gif"); 
function rollover(objet, img){ 
   objet.src = img; 
}