function get_by_id(id){
	if(document.getElementById) return(document.getElementById(id));
	if(document.all) return(document.all[id]);
	else return(0);
};
var divID;
function aff_apercu(id){
    var div=get_by_id('apercu');
    div.innerHTML='<img class="apercu" src="apercus/'+id+'.jpg"/>';
    divID=get_by_id('apercu');
    divID.style.visibility='visible';
}
function cach_apercu(){
    divID=get_by_id('apercu');
    divID.style.visibility='hidden';
}