Go to admin, click Headers and Footers (under Customize your Forum), then choose where you want to put it. In this site I put it on "Main Header / Footer".
Oh here's the code that you should put on the header:
<!--
######################################################
# JAVASCRIPT POPUPS ROUTINE VERSION #7 07-Feb-2001 #
# Written by Mike McGrath [mike_mcgrath@lineone.net] #
# PC-Tested for Netscape 3.04, 4.61, 6.0, & IE5.5 #
# Note: Popups may not cover all form field inputs. #
# PLEASE RETAIN THIS NOTICE WHEN COPYING MY SCRIPT. #
# THIS SCRIPT IS COPYRIGHT OF MIKE MCGRATH 1998-2001 #
######################################################
-->
<script type="text/javascript">
<!-- Original: Mike McGrath (mike_mcgrath@lineone.net) -->
<!-- Web Site:
website.lineone.net/~mike_mcgrath -->
<!--
var Xoffset=-50; // modify these values to ...
var Yoffset= -70; // change the popup position.
var popwidth=120; // popup width
var bcolor="E4B830"; // popup border color
var fcolor="white"; // popup font color
var fface="arial"; // popup font face
// create content box
document.write("<DIV ID='pup'></DIV>");
// id browsers
var iex=(document.all);
var nav=(document.layers);
var old=(navigator.appName=="Netscape" && !document.layers && !document.getElementById);
var n_6=(window.sidebar);
// assign object
var skin;
if(nav) skin=document.pup;
if(iex) skin=pup.style;
if(n_6) skin=document.getElementById("pup").style;
// park modifier
var yyy=-1000;
// capture pointer
if(nav)document.captureEvents(Event.MOUSEMOVE);
if(n_6) document.addEventListener("mousemove",get_mouse,true);
if(nav||iex)document.onmousemove=get_mouse;
// set dynamic coords
function get_mouse(e)
{
var x,y;
if(nav || n_6) x=e.pageX;
if(iex) x=event.x+document.body.scrollLeft;
if(nav || n_6) y=e.pageY;
if(iex)
{
y=event.y;
if(navigator.appVersion.indexOf("MSIE 4")==-1)
y+=document.body.scrollTop;
}
if(iex || nav)
{
skin.top=y+yyy;
skin.left=x+Xoffset;
}
if(n_6)
{
skin.top=(y+yyy)+"px";
skin.left=x+Xoffset+"px";
}
nudge(x);
}
// avoid edge overflow
function nudge(x)
{
var extreme,overflow,temp;
// right
if(iex) extreme=(document.body.clientWidth-popwidth);
if(n_6 || nav) extreme=(window.innerWidth-popwidth);
if(parseInt(skin.left)>extreme)
{
overflow=parseInt(skin.left)-extreme;
temp=parseInt(skin.left);
temp-=overflow;
if(nav || iex) skin.left=temp;
if(n_6)skin.left=temp+"px";
}
// left
if(parseInt(skin.left)<1)
{
overflow=parseInt(skin.left)-1;
temp=parseInt(skin.left);
temp-=overflow;
if(nav || iex) skin.left=temp;
if(n_6)skin.left=temp+"px";
}
}
// write content & display
function popup(msg,fcolor,bak,tribe)
{
var content="<TABLE WIDTH='"+popwidth+"' BORDER='0' BORDERCOLOR="+bcolor+" CELLPADDING=2 CELLSPACING=0 "+"BGCOLOR="+bak+"><TD><FONT COLOR="+fcolor+" FACE="+fface+" SIZE='2'>"+msg+"</FONT></TD></TABLE>";
if(old)
{
alert(msg);
return;
}
yyy=Yoffset;
skin.width=popwidth;
if(nav)
{
skin.document.open();
skin.document.write(content);
skin.document.close();
skin.visibility="visible";
}
if(iex)
{
pup.innerHTML=content;
skin.visibility="visible";
}
if(n_6)
{
document.getElementById("pup").innerHTML=content;
skin.visibility="visible";
}
}
// write content & display & change pic
// written by JP
function popup2(msg,bak,imgobj,imgname)
{
var content="<TABLE WIDTH='"+popwidth+"' BORDER='0' BORDERCOLOR="+bcolor+" CELLPADDING=2 CELLSPACING=0 "+"BGCOLOR="+bak+"><TD ALIGN='center'><FONT COLOR="+fcolor+" FACE="+fface+" SIZE='2'>"+msg+"</FONT></TD></TABLE>";
if(old)
{
alert(msg);
return;
}
yyy=Yoffset;
skin.width=popwidth;
if(nav)
{
skin.document.open();
skin.document.write(content);
skin.document.close();
skin.visibility="visible";
}
if(iex)
{
pup.innerHTML=content;
skin.visibility="visible";
}
if(n_6)
{
document.getElementById("pup").innerHTML=content;
skin.visibility="visible";
}
document.getElementById(imgobj).src="http://img.photobucket.com/albums/v426/jaypeesol/forumimages/thefarm/farmers/"+imgname;
}
// park content box
function kill()
{
if(!old)
{
yyy=-1000;
skin.visibility="hidden";
skin.width=0;
}
}
function kill2(imgobj,imgname)
{
if(!old)
{
yyy=-1000;
skin.visibility="hidden";
skin.width=0;
}
document.getElementById(imgobj).src="http://img.photobucket.com/albums/v426/jaypeesol/forumimages/thefarm/farmers/"+imgname;
}
//-->
</script>
<STYLE>
<!--
#pup {position:absolute; visibility:hidden; z-index:200; width:260; }
-->
</STYLE>
<table align='center'>
<tr><td bgcolor="#744400">
<table align="center" cellspacing="1" cellpadding="0">
<tr>
<td><img onmouseover="popup('<b>Aeris</b><br>Devonport', '#FFFFFF', 'green')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_aeris.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Cecil</b><br>Burnie', '#000000', 'orange')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_cecil.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Celes</b><br>Burnie', '#000000', 'orange')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_celes.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Cid</b><br>Devonport', '#FFFFFF', 'green')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_cid.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Cloud</b><br>Burnie', '#000000', 'orange')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_cloud.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Faris</b><br>Devonport', '#FFFFFF', 'green')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_faris.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Kefka</b><br>Devonport', '#FFFFFF', 'green')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_kefka.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Rikku</b><br>Burnie', '#000000', 'orange')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_rikku.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Rinoa</b><br>Devonport', '#FFFFFF', 'green')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_rinoa.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Sabin</b><br>Burnie', '#000000', 'orange')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_sabin.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Sephiroth</b><br>Devonport', '#FFFFFF', 'green')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_sephiroth.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Squall</b><br>Burnie', '#000000', 'orange')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_squall.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Terra</b><br>Burnie', '#000000', 'orange')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_terra.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Tidus</b><br>Devonport', '#FFFFFF', 'green')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_tidus.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Tifa</b><br>Devonport', '#FFFFFF', 'green')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_tifa.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Yuffie</b><br>Burnie', '#000000', 'orange')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_yuffie.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Yuna</b><br>Devonport', '#FFFFFF', 'green')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_yuna.jpg" width=50 height=61 border=0></td>
<td><img onmouseover="popup('<b>Zidane</b><br>Burnie', '#000000', 'orange')" onmouseout="kill()" src="http://img.photobucket.com/albums/v426/jaypeesol/survivorff/icon_zidane.jpg" width=50 height=61 border=0></td>
</tr>
</table>
</td></tr></table>