function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function navbar_image_swap(icon_name, icon_state)
{
  if (ocument.images)
  {
    myImage = eval(icon_name + "_" + icon_state + ".src");
    document.images[icon_name].src = myImage;
  }
}

/***********************************************
* Cool DHTML tooltip script- © Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
***********************************************/

var offsetxpoint=-60 //Customize x offset of tooltip
var offsetypoint=-35 //Customize y offset of tooltip
var ie=document.all
var ns6=document.getElementById && !document.all
var enabletip=false
if (ie||ns6)
{
  var tipobj=document.all ? document.all["dhtmltooltip"] : document.getElementById ? document.getElementById("dhtmltooltip") : document.layers ? document.layers["dhtmltooltip"] : ""
}
function ietruebody(){
return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function ddrivetip(thetext, thecolor, thewidth)
{
   var tipobj=document.all ? document.all["dhtmltooltip"] : document.getElementById ? document.getElementById("dhtmltooltip") : document.layers ? document.layers["dhtmltooltip"] : ""

   if (ns6||ie)
   {
      if (typeof thewidth!="undefined") tipobj.style.width=thewidth+"px"
      if (typeof thecolor!="undefined" && thecolor!="") tipobj.style.backgroundColor=thecolor
      tipobj.innerHTML=thetext
      enabletip=true
      return false
   }
}

function positiontip(e)
{
   if (enabletip)
   {
      var curX=(ns6)?e.pageX : event.x+ietruebody().scrollLeft;
      var curY=(ns6)?e.pageY : event.y+ietruebody().scrollTop;
      //Find out how close the mouse is to the corner of the window
      var rightedge=ie&&!window.opera? ietruebody().clientWidth-event.clientX-offsetxpoint : window.innerWidth-e.clientX-offsetxpoint-20
      var bottomedge=ie&&!window.opera? ietruebody().clientHeight-event.clientY-offsetypoint : window.innerHeight-e.clientY-offsetypoint-20

      var leftedge=(offsetxpoint<0)? offsetxpoint*(-1) : -1000

      //if the horizontal distance isn't enough to accomodate the width of the context menu
      if (rightedge<tipobj.offsetWidth)
      //move the horizontal position of the menu to the left by it's width
         tipobj.style.left=ie? ietruebody().scrollLeft+event.clientX-tipobj.offsetWidth+"px" : window.pageXOffset+e.clientX-tipobj.offsetWidth+"px"
      else if (curX<leftedge)
         tipobj.style.left="5px"
      else
         //position the horizontal position of the menu where the mouse is positioned
         tipobj.style.left=curX+offsetxpoint+"px"

      //same concept with the vertical position
      if (bottomedge<tipobj.offsetHeight)
            tipobj.style.top=ie? ietruebody().scrollTop+event.clientY-tipobj.offsetHeight-offsetypoint+"px" : window.pageYOffset+e.clientY-tipobj.offsetHeight-offsetypoint+"px"
      else
            tipobj.style.top=curY+offsetypoint+"px"
      tipobj.style.visibility="visible"
   }
}

function hideddrivetip()
{
   if (ns6||ie)
   {
      enabletip=false
      tipobj.style.visibility="hidden"
      tipobj.style.left="-1000px"
      tipobj.style.backgroundColor=''
      tipobj.style.width=''
   }
}

document.onmousemove=positiontip
<!--tooltip end-->