var NS4 = document.layers ? 1 : 0;
var IE4 = document.all  ? 1 : 0;
var gecko = document.getElementById && !document.all ? 1 : 0;
var windowPos = 10;
if (IE4) {
	menu.style.pixelTop = 30;
}


function slide() {

  YOffset = (NS4 || gecko) ? self.pageYOffset : document.body.scrollTop;
  if (YOffset <= windowPos && windowPos == 10) return;
  if (YOffset > windowPos) {
    deltaY = Math.ceil(Math.abs(YOffset - windowPos) / 8);
  }
  else {
    if (YOffset > 15) {
      deltaY = Math.ceil(Math.abs(YOffset - windowPos) / 8);
    }
    else {
      deltaY = Math.ceil(Math.abs(10 - windowPos) / 8);
    }
  }
  if (YOffset <= windowPos) 
  	deltaY = 0 - deltaY;
  if (NS4) {
    document.layers['menu'].top += deltaY;
  }
  else if (gecko) {
    document.getElementById('menu').style.top = windowPos + deltaY + 20;
  }
  else if (IE4) {
    menu.style.pixelTop += deltaY; <!-- document.all['nav'].style.pixelTop -->
  }
  windowPos += deltaY;
}

var track = setInterval("slide();", 20);

function stopTrack() {
  clearInterval(track);
}

function restartTrack() {
  clearInterval(track);
  track = setInterval("slide();", 30);
}


function toSee() { 
   
    if((document.getElementById) && (!document.all)){
	if (document.getElementById('menu').style.visibility == "hidden") {
    		document.getElementById('menu').style.visibility = "visible";
		document.getElementById('navimg').src = "images/up.gif";
    	} else {
		document.getElementById('menu').style.visibility = "hidden";
		document.getElementById('navimg').src = "images/down.gif";
        }
    } 
    if(document.all) {
	if (document.all['menu'].style.visibility == "hidden"){
    		document.all['menu'].style.visibility = "visible";
		document.all['menu'].style.display="block";
		document.all['navimg'].src = "images/up.gif";
		document.all['menu'].style.top = 30;
	} else {
		document.all['menu'].style.visibility = "hidden";
		document.all['menu'].style.display="none";
		document.all['navimg'].src = "images/down.gif";
	} 
    }   
    if(document.layers) {
	if (document.layers['menu'].visibility == "hide"){
    		document.layers['menu'].visibility = "show";
		document.layers['navimg'].src = "images/up.gif";
	} else { 
		document.layers['menu'].visibility = "hide";
		document.layers['navimg'].src = "images/down.gif";
	} 
     }
     return false;
}