var ritems = new Array();
var ritemids = new Array();
var currentrstringindexes = new Array();

function addRotateItem(itemid,rstrings) {
    ritems[ritems.length] = rstrings;
    ritemids[ritemids.length] = itemid
    currentrstringindexes[currentrstringindexes.length] = 0;
}

function rotateAll() {
  for (var i = 0; i < ritems.length; i++) {
    var rstrings = ritems[i];
    var itemid = ritemids[i];
    var currentindex = currentrstringindexes[i];
    currentindex++;
    if (currentindex > rstrings.length-1) { currentindex = 0; }
    document.getElementById(itemid).innerHTML=rstrings[currentindex];
    currentrstringindexes[i] = currentindex;      
    }
  }

var timer = window.setInterval("rotateAll()", 3500);