var DOSSIER_SQUELETTE='squelettes';
var bgs=new Array(
DOSSIER_SQUELETTE+'/images/hh.gif',
DOSSIER_SQUELETTE+'/images/hb.gif',
DOSSIER_SQUELETTE+'/images/vg.gif',
DOSSIER_SQUELETTE+'/images/vgspe.gif',
DOSSIER_SQUELETTE+'/images/vd.gif',
DOSSIER_SQUELETTE+'/images/vdspe.gif',
DOSSIER_SQUELETTE+'/images/chg.gif',
DOSSIER_SQUELETTE+'/images/chd.gif',
DOSSIER_SQUELETTE+'/images/cbg.gif',
DOSSIER_SQUELETTE+'/images/cbd.gif',
DOSSIER_SQUELETTE+'/images/hp.gif',
DOSSIER_SQUELETTE+'/images/hp2.gif',
DOSSIER_SQUELETTE+'/images/hp2_roll.gif',
DOSSIER_SQUELETTE+'/images/hp_roll.gif',
DOSSIER_SQUELETTE+'/images/arc.gif',
DOSSIER_SQUELETTE+'/images/photo01.jpg',
DOSSIER_SQUELETTE+'/images/photo02.jpg',
DOSSIER_SQUELETTE+'/images/photo03.jpg',
DOSSIER_SQUELETTE+'/images/photo04.jpg',
DOSSIER_SQUELETTE+'/images/photo05.jpg',
DOSSIER_SQUELETTE+'/images/photo06.jpg',
DOSSIER_SQUELETTE+'/images/photo07.jpg',
DOSSIER_SQUELETTE+'/images/boutonsuivante.gif',
DOSSIER_SQUELETTE+'/images/boutonsuivante_roll.gif'
);

function randomizeBG(id) {
     var i=Math.floor(Math.random()*7)+15;
 if(bgs.cache[i].complete) {
     var el=document.getElementById(id);
     var bg="url("+bgs.cache[i].src+")";
     el.style.backgroundImage=bg;
      } 
 }

function preloadBG() {
//cache the images
bgs.Len = bgs.length;
bgs.cache = [];
for(var i=0; i<bgs.Len; i++)
{
	bgs.cache[i] = new Image;
	bgs.cache[i].src = bgs[i];
}

}

function changeBG(id,no) {
     var el=document.getElementById(id);
	if(no=='arc') {
     	 var bg="url("+DOSSIER_SQUELETTE+'/images/arc.gif'+")";
     	 el.style.backgroundImage=bg;
	}
	else
	{
     	 var bg="url("+bgs[no]+")";
	if(bgs.cache[no].complete) {
     	 el.style.backgroundImage=bg;
		}
	}
}