Tooltip text not showing

[.Net Sports]

I have a javascript/css/dhtml script that does a tooltip mouseover,
but i cannot get the text inside the tooltip baloon to appear, even
tho the balloon works great when mousing over the link . I even try
assigning a black font color inside the css:

// css inside page header:
<style type="text/css">
#dhtmltooltip{
position: absolute;
left: -300px;
width: 150px;
border: 1px solid black;
padding: 2px;
background-color: lightyellow;
font-color: black;
/*visibility: hidden;*/
z-index: 100;
/*Remove below line to remove shadow. Below line should always appear
last within this CSS*/
filter:
progidXImageTransform.Microsoft.Shadow(color=gray,direction=135);
}

#dhtmlpointer{
position:absolute;
left: -300px;
z-index: 101;
visibility: hidden;
}</style>

// javascript after body tag:
<script type="text/javascript">

var offsetfromcursorX=12 //Customize x offset of tooltip
var offsetfromcursorY=10 //Customize y offset of tooltip

var offsetdivfrompointerX=10 //Customize x offset of tooltip DIV
relative to pointer image
var offsetdivfrompointerY=14 //Customize y offset of tooltip DIV
relative to pointer image. Tip: Set it to (height_of_pointer_image-1).

document.write('<div id="dhtmltooltip"></div>') //write out tooltip
DIV
document.write('<img id="dhtmlpointer" src="labor-unions/
ttarrow.gif">') //write out pointer image

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") : ""

var pointerobj=document.all? document.all["dhtmlpointer"] :
document.getElementById? document.getElementById("dhtmlpointer") : ""

function ietruebody(){
return (document.compatMode && document.compatMode!="BackCompat")?
document.documentElement : document.body
}

function ddrivetip(thetext, thewidth, thecolor){
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 nondefaultpos=false
var curX=(ns6)?e.pageX : event.clientX+ietruebody().scrollLeft;
var curY=(ns6)?e.pageY : event.clientY+ietruebody().scrollTop;
//Find out how close the mouse is to the corner of the window
var winwidth=ie&&!window.opera? ietruebody().clientWidth :
window.innerWidth-20
var winheight=ie&&!window.opera? ietruebody().clientHeight :
window.innerHeight-20

var rightedge=ie&&!window.opera? winwidth-event.clientX-
offsetfromcursorX : winwidth-e.clientX-offsetfromcursorX
var bottomedge=ie&&!window.opera? winheight-event.clientY-
offsetfromcursorY : winheight-e.clientY-offsetfromcursorY

var leftedge=(offsetfromcursorX<0)? offsetfromcursorX*(-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=curX-tipobj.offsetWidth+"px"
nondefaultpos=true
}
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+offsetfromcursorX-offsetdivfrompointerX+"px"
pointerobj.style.left=curX+offsetfromcursorX+"px"
}

//same concept with the vertical position
if (bottomedge<tipobj.offsetHeight){
tipobj.style.top=curY-tipobj.offsetHeight-offsetfromcursorY+"px"
nondefaultpos=true
}
else{
tipobj.style.top=curY+offsetfromcursorY+offsetdivfrompointerY+"px"
pointerobj.style.top=curY+offsetfromcursorY+"px"
}
tipobj.style.visibility="visible"
if (!nondefaultpos)
pointerobj.style.visibility="visible"
else
pointerobj.style.visibility="hidden"
}
}

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

document.onmousemove=positiontip

</script>
// link and div elements to mouseover:

<a href="http://www.yahoo.com" onMouseover="ddrivetip('Visit
Yahoo.com')";
onMouseout="hideddrivetip()">Search Engine</a>

any help gratefully appreciated!
..netsports