var rolls=new Array();
rolls[0]="navrc";
rolls[1]="navlit";
rolls[2]="navbd";
rolls[3]="navcine";
rolls[4]="navarts";
rolls[5]="navcontact";
rolls[6]="navje";
rolls[7]="rolloff";

function contenu (vis){
for (i=0;i<8;i++) {

	if (document.getElementById){
	document.getElementById(rolls[i]).style.visibility = vis;
			}
	else if (document.all)
	{
		document.all[rolls[i]].style.visibility = vis;
	}
	else 
	{document.rolls[i].visibility=vis;}
}
}
      function init() {
               setTimeout("contenu('visible')",6000);
         }