i use this javascript but the mouse over image displaed at the back of my template.can someone help me. heres the script i used

/*
Simple Image Trail script- By JavaScriptKit.com
Visit http://www.javascriptkit.com for this script and more
This notice must stay intact
*/

var w=1
var h=1

if (document.getElementById || document.all)
document.write('<div id="trailimageid" style="position:absolute;visibility:hidden;left:0px;top:-1000px;width:1px;height:1px;border:1px solid #888888;background:#DDDDDD;"><img id="ttimg" src="img/s.gif" /></div>')

function gettrailobj()
{
if (document.getElementById) return document.getElementById("trailimageid").style
else if (document.all) return document.all.trailimagid.style
}

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

function hidetrail()
{
document.onmousemove=""
document.getElementById('ttimg').src='img/s.gif'
gettrailobj().visibility="hidden"
gettrailobj().left=-1000
gettrailobj().top=0
}


function showtrail(width,height,file)
{
if(navigator.userAgent.toLowerCase().indexOf('opera') == -1 && navigator.userAgent.toLowerCase().indexOf('safari') == -1)
{
w=width
h=height

// followmouse()

gettrailobj().visibility="visible"
gettrailobj().width=w+"px"
gettrailobj().height=h+"px"
document.getElementById('ttimg').src=file
document.onmousemove=followmouse
}
}


function followmouse(e)
{

if(navigator.userAgent.toLowerCase().indexOf('opera') == -1 && navigator.userAgent.toLowerCase().indexOf('safari') == -1)
{

var xcoord=20
var ycoord=20

if (typeof e != "undefined")
{
xcoord+=e.pageX
ycoord+=e.pageY
}
else if (typeof window.event !="undefined")
{
xcoord+=truebody().scrollLeft+event.clientX
ycoord+=truebody().scrollTop+event.clientY
}

var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-15
var docheight=document.all? Math.max(truebody().scrollHeight, truebody().clientHeight) : Math.max(document.body.offsetHeight, window.innerHeight)

if (xcoord+w+3>docwidth)
xcoord=xcoord-w-(20*2)

if (ycoord-truebody().scrollTop+h>truebody().clientHeight)
ycoord=ycoord-h-20;

gettrailobj().left=xcoord+"px"
gettrailobj().top=ycoord+"px"

}

}



my html script
<img onmouseover="showtrail(400,362,'images/wedding.gif');" onmouseout="hidetrail();" src="images/wedding1.gif" width="90" height="80" />


pls help