var timerID = null;
var timerOn = false;
var timecount = 500;
var what = null;
var newbrowser = true;
var check = false;

function initnav(){
  if (document.layers) {
    layerRef="document.layers";
    styleSwitch="";
    visibleVar="show";
    screenSize = window.innerWidth;
    what ="ns4";
  }else if(document.all){
    layerRef="document.all";
    styleSwitch=".style";
    visibleVar="visible";
    screenSize = document.body.clientWidth + 18;
    what ="ie";
  }else if(document.getElementById){
    layerRef="document.getElementByID";
    styleSwitch=".style";
    visibleVar="visible";
    what="moz";
    
  }else{
    what="none";
    newbrowser = false;
  }
    
  check = true;
}

function showLayer(layerName)
{
	if(check) {
		if (what =="none") return;
		if (what == "moz") {
			var e = document.getElementById(layerName)
			if (e != null) e.style.visibility="visible";
		} else {
			if (eval(layerRef+'["'+layerName+'"]')!= null) {
				eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="visible"');
			}
		}
	} else {
		return;
	}
}

function hideLayer(layerName)
{
	if(check) {
		if (what =="none") return;
		if (what == "moz") {
			var e = document.getElementById(layerName)
			if (e != null) e.style.visibility="hidden"; 
		} else 	{
			if (eval(layerRef+'["'+layerName+'"]') != null) {
				eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="hidden"');
			}
		}
	} else { 
		return;
	}
}
    
function hideAll(){
	for (i = 0; i < 20; i++) //?php echo $mm_item_cnt; ?>
	{
		hideLayer('div'+i);
	}
}

function startTime() {
  if (timerOn == false) {
    timerID=setTimeout( "hideAll()" , timecount);
    timerOn = true;
    }
}

function stopTime() {
  if (timerOn) {
    clearTimeout(timerID);
    timerID = null;
    timerOn = false;
  }
}

function ReplaceImg(img,ref)
{
  document.images[img].src = ref;
}