Problema con paso de variables!!

[LethalIndustry]

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// initial position
var dn_startpos=120;
// end position
var dn_endpos=alto;
// Speed of scroller higher number = slower scroller
var dn_speed=30;
// ID of the news box
var dn_newsID='news';
// class to add when JS is available
var dn_classAdd='hasJS';
// Message to stop scroller
var dn_stopMessage='';//'Stop scroller';
// ID of the generated paragraph
var dn_paraID='DOMnewsstopper';

/* Initialise scroller when window loads */
window.onload=function()
{
// check for DOM
if(!document.getElementById || !document.createTextNode){return;}
initDOMnews();
// add more functions as needed
}
/* stop scroller when window is closed */
window.onunload=function()
{
clearInterval(dn_interval);
}

/*
This is the functional bit, do not press any buttons or flick any switches
without knowing what you are doing!
*/

var dn_scrollpos=dn_startpos;
/* Initialise scroller */
function initDOMnews()
{
var n=document.getElementById(dn_newsID);
if(!n){return;}
n.className=dn_classAdd;
dn_interval=setInterval('scrollDOMnews()',dn_speed );
var newa=document.createElement('a');
var newp=document.createElement('p');
newp.setAttribute('id',dn_paraID);
newa.href='#';
newa.appendChild(document.createTextNode(dn_stopMe ssage));
newa.onclick=stopDOMnews;
newp.appendChild(newa);
n.parentNode.insertBefore(newp,n.nextSibling);
n.onmouseover=function()
{
clearInterval(dn_interval);
}
n.onmouseout=function()
{
dn_interval=setInterval('scrollDOMnews()',dn_speed );
}
}

function stopDOMnews()
{
clearInterval(dn_interval);
var n=document.getElementById('news');
n.className='';
n.parentNode.removeChild(n.nextSibling);
return false;
}
function scrollDOMnews()
{
var n=document.getElementById(dn_newsID).getElementsBy TagName('ul')[0];
n.style.top=dn_scrollpos+'px';
if(dn_scrollpos==dn_endpos){dn_scrollpos=dn_startp os;}
dn_scrollpos--;
}