You forgot the closing single quote (') at the end of the marqueecontent variable.
Why not go for all of what you had though? That one bit of text and image isn't enough to fill out a marquee of that height anyway.
Here's a demo with your original content:
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css">
#iemarquee, #iemarquee2 {
text-align: center;
}
</style>
</head>
<body>
<script type="text/javascript">
/***********************************************
* SAG Content Scroller- (c) Dynamic Drive DHTML code library (www.dynamicdrive.com)
* Visit http://www.dynamicDrive.com for hundreds of DHTML scripts
* This notice must stay intact for legal use
***********************************************/
//Specify the marquee's width (in pixels)
var marqueewidth="200px"
//Specify the marquee's height
var marqueeheight="150px"
//Specify the marquee's marquee speed (larger is faster 1-10)
var marqueespeed=1
//Specify initial pause before scrolling in milliseconds
var initPause=1000
//Specify start with Full(1)or Empty(0) Marquee
var full=1
//Pause marquee onMousever (0=no. 1=yes)?
var pauseit=1
//Specify Break characters for IE as the two iterations
//of the marquee, if text, will be too close together in IE
var iebreak='<p></p>'
//Specify the marquee's content
//Keep all content on ONE line, and backslash any single quotations (ie: that\'s great):
//var marqueecontent='<font face="Verdana">Thank you for visiting <a href="http://www.dynamicdrive.com">Dynamic Drive.</a><p></p>If you find this script useful, please consider linking to us by <a href="../link.htm">clicking here.</a><p></p>Visit our partner <a href="http://javascriptkit.com">JavaScript Kit</a> for JavaScript tutorials.</font><p></p>'
var marqueecontent='<div><div style="font-family:Verdana;font-size:14px;font-style:normal;font-weight:bold;color:red">Next-Generation-Hosting</div><br /><a href="http://ng-hosting.de/" target="_blank"><img src="http://www.ng-hosting.de/images/linkus/4.jpg" WIDTH="105" HEIGHT="40" /></a><img src="http://www.brainlag.eu/banner_friends/trennlinie.png"><div style="font-family:Verdana;font-size:14px;font-style:normal;font-weight:bold;color:darkgreen">WeeD Community</div><br /><a href="http://irc-stoners.de/" target="_blank"><img src="http://www.brainlag.eu/banner_friends/irc-stoners.png" WIDTH="200" /></a><br /><div style="font-family:Verdana;font-size:14px;font-style:normal;font-weight:bold;color:darkgreen">at Quakenet</div><img src="http://www.brainlag.eu/banner_friends/trennlinie.png"><div style="font-family:Verdana;font-size:14px;font-style:normal;font-weight:bold;color:black">Blog and More</div><br /><a href="http://www.p4cm4n.de/" target="_blank"><img src="http://www.brainlag.eu/banner_friends/p4cm4n.png" WIDTH="200" /></a><img src="http://www.brainlag.eu/banner_friends/trenn_unten.png"></div>'
////NO NEED TO EDIT BELOW THIS LINE////////////
var copyspeed=marqueespeed
var pausespeed=(pauseit==0)? copyspeed: 0
var iedom=document.all||document.getElementById
var actualheight=''
var cross_marquee, cross_marquee2, ns_marquee
function populate(){
if (iedom){
var lb=document.getElementById&&!document.all? '' : iebreak
cross_marquee=document.getElementById? document.getElementById("iemarquee") : document.all.iemarquee
cross_marquee2=document.getElementById? document.getElementById("iemarquee2") : document.all.iemarquee2
cross_marquee.style.top=(full==1)? '8px' : parseInt(marqueeheight)+8+"px"
cross_marquee2.innerHTML=cross_marquee.innerHTML=marqueecontent+lb
actualheight=cross_marquee.offsetHeight
cross_marquee2.style.top=(parseInt(cross_marquee.style.top)+actualheight+8)+"px" //indicates following #1
}
else if (document.layers){
ns_marquee=document.ns_marquee.document.ns_marquee2
ns_marquee.top=parseInt(marqueeheight)+8
ns_marquee.document.write(marqueecontent)
ns_marquee.document.close()
actualheight=ns_marquee.document.height
}
setTimeout('lefttime=setInterval("scrollmarquee()",20)',initPause)
}
if (window.addEventListener){
window.addEventListener('load', populate, false);
}
else if (window.attachEvent){
window.attachEvent('onload', populate);
}
function scrollmarquee(){
if (iedom){
if (parseInt(cross_marquee.style.top)<(actualheight*(-1)+8))
cross_marquee.style.top=(parseInt(cross_marquee2.style.top)+actualheight+8)+"px"
if (parseInt(cross_marquee2.style.top)<(actualheight*(-1)+8))
cross_marquee2.style.top=(parseInt(cross_marquee.style.top)+actualheight+8)+"px"
cross_marquee2.style.top=parseInt(cross_marquee2.style.top)-copyspeed+"px"
cross_marquee.style.top=parseInt(cross_marquee.style.top)-copyspeed+"px"
}
else if (document.layers){
if (ns_marquee.top>(actualheight*(-1)+8))
ns_marquee.top-=copyspeed
else
ns_marquee.top=parseInt(marqueeheight)+8
}
}
if (iedom||document.layers){
with (document){
if (iedom){
write('<div style="position:relative;width:'+marqueewidth+';height:'+marqueeheight+';overflow:hidden" onMouseover="copyspeed=pausespeed" onMouseout="copyspeed=marqueespeed">')
write('<div id="iemarquee" style="position:absolute;left:0px;top:0px;width:100%;">')
write('</div><div id="iemarquee2" style="position:absolute;left:0px;top:0px;width:100%;z-index:100;background:white;">')
write('</div></div>')
}
else if (document.layers){
write('<ilayer width='+marqueewidth+' height='+marqueeheight+' name="ns_marquee">')
write('<layer name="ns_marquee2" width='+marqueewidth+' height='+marqueeheight+' left=0 top=0 onMouseover="copyspeed=pausespeed" onMouseout="copyspeed=marqueespeed"></layer>')
write('</ilayer>')
}
}
}
</script>
</body>
</html>
Note: For some reason that I'm not sure of, the spans in your content were causing problems. I changed them to divs and that seems to work fine.