Matrix text effect question

sorry about the stars, Youll need to find and replace them.

There we go, done it for you.

Code:

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var rows=11; // must be an odd number
var speed=50; // lower is faster
var reveal=2; // between 0 and 2 only. The higher, the faster the word appears
var effectalign="default" //enter "center" to center it.
var redirectURL = "http://www.your-page.com";
var timeAfter = 500;
/***********************************************
* The Matrix Text Effect- by Richard Womersley (http://www.mf2fm.co.uk/rv)
* This notice must stay intact for use
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/

var w3c=document.getElementById && !window.opera;;
var ie45=document.all && !window.opera;
var ma_tab, matemp, ma_bod, ma_row, x, y, columns, ma_txt, ma_cho;
var m_coch=new Array();
var m_copo=new Array();
window.onload=function() {
        if (!w3c && !ie45) return
 var matrix=(w3c)?document.getElementById("matrix"):document.all["matrix"];
 ma_txt=(w3c)?matrix.firstChild.nodeValue:matrix.innerHTML;
 ma_txt=" "+ma_txt+" ";
 columns=ma_txt.length;
 if (w3c) {
  while (matrix.childNodes.length) matrix.removeChild(matrix.childNodes[0]);
  ma_tab=document.createElement("table");
  ma_tab.setAttribute("border", 0);
  ma_tab.setAttribute("align", effectalign);
  ma_tab.style.backgroundColor="#000000";
  ma_bod=document.createElement("tbody");
  for (x=0; x<rows; x++) {
  ma_row=document.createElement("tr");
  for (y=0; y<columns; y++) {
    matemp=document.createElement("td");
    matemp.setAttribute("id", "Mx"+x+"y"+y);
    matemp.className="matrix";
    matemp.appendChild(document.createTextNode(String.fromCharCode(160)));
    ma_row.appendChild(matemp);
  }
  ma_bod.appendChild(ma_row);
  }
  ma_tab.appendChild(ma_bod);
  matrix.appendChild(ma_tab);
 } else {
  ma_tab='<ta'+'ble align="'+effectalign+'" border="0" style="background-color:#000000">';
  for (var x=0; x<rows; x++) {
  ma_tab+='<t'+'r>';
  for (var y=0; y<columns; y++) {
    ma_tab+='<t'+'d class="matrix" id="Mx'+x+'y'+y+'"></'+'td>';
  }
  ma_tab+='</'+'tr>';
  }
  ma_tab+='</'+'table>';
  matrix.innerHTML=ma_tab;
 }
 ma_cho=ma_txt;
 for (x=0; x<columns; x++) {
  ma_cho+=String.fromCharCode(32+Math.floor(Math.random()94));
  m_copo[x]=0;
 }
 ma_bod=setInterval("mytricks()", speed);
}

function mytricks() {
 x=0;
 for (y=0; y<columns; y++) {
  x=x+(m_copo[y]==100);
  ma_row=m_copo[y]%100;
  if (ma_row && m_copo[y]<100) {
  if (ma_row<rows+1) {
    if (w3c) {
    matemp=document.getElementById("Mx"+(ma_row-1)+"y"+y);
    matemp.firstChild.nodeValue=m_coch[y];
    }
    else {
    matemp=document.all["Mx"+(ma_row-1)+"y"+y];
    matemp.innerHTML=m_coch[y];
    }
    matemp.style.color="#33ff66";
    matemp.style.fontWeight="bold";
  }
  if (ma_row>1 && ma_row<rows+2) {
    matemp=(w3c)?document.getElementById("Mx"+(ma_row-2)+"y"+y):document.all["Mx"+(ma_row-2)+"y"+y];
    matemp.style.fontWeight="normal";
    matemp.style.color="#00ff00";
  }
  if (ma_row>2) {
    matemp=(w3c)?document.getElementById("Mx"+(ma_row-3)+"y"+y):document.all["Mx"+(ma_row-3)+"y"+y];
    matemp.style.color="#009900";
  }
  if (ma_row<Math.floor(rows/2)+1) m_copo[y]++;
  else if (ma_row==Math.floor(rows/2)+1 && m_coch[y]==ma_txt.charAt(y)) zoomer(y);
  else if (ma_row<rows+2) m_copo[y]++;
  else if (m_copo[y]<100) m_copo[y]=0;
  }
  else if (Math.random()>0.9 && m_copo[y]<100) {
  m_coch[y]=ma_cho.charAt(Math.floor(Math.random()ma_cho.length));
  m_copo[y]++;
  }
 }
 if (x==columns){
 clearInterval(ma_bod);
 setTimeout("location.href = redirectURL;",timeAfter + y);
 }
}

function zoomer(ycol) {
 var mtmp, mtem, ytmp;
 if (m_copo[ycol]==Math.floor(rows/2)+1) {
  for (ytmp=0; ytmp<rows; ytmp++) {
  if (w3c) {
    mtmp=document.getElementById("Mx"+ytmp+"y"+ycol);
    mtmp.firstChild.nodeValue=m_coch[ycol];
  }
  else {
    mtmp=document.all["Mx"+ytmp+"y"+ycol];
    mtmp.innerHTML=m_coch[ycol];
  }
  mtmp.style.color="#33ff66";
  mtmp.style.fontWeight="bold";
  }
  if (Math.random()<reveal) {
  mtmp=ma_cho.indexOf(ma_txt.charAt(ycol));
  ma_cho=ma_cho.substring(0, mtmp)+ma_cho.substring(mtmp+1, ma_cho.length);
  }
  if (Math.random()<reveal-1) ma_cho=ma_cho.substring(0, ma_cho.length-1);
  m_copo[ycol]+=199;
  setTimeout("zoomer("+ycol+")", speed);
 }
 else if (m_copo[ycol]>200) {
  if (w3c) {
  mtmp=document.getElementById("Mx"+(m_copo[ycol]-201)+"y"+ycol);
  mtem=document.getElementById("Mx"+(200+rows-m_copo[ycol]--)+"y"+ycol);
  }
  else {
  mtmp=document.all["Mx"+(m_copo[ycol]-201)+"y"+ycol];
  mtem=document.all["Mx"+(200+rows-m_copo[ycol]--)+"y"+ycol];
  }
  mtmp.style.fontWeight="normal";
  mtem.style.fontWeight="normal";
  setTimeout("zoomer("+ycol+")", speed);
 }
 else if (m_copo[ycol]==200) m_copo[ycol]=100+Math.floor(rows/2);
 if (m_copo[ycol]>100 && m_copo[ycol]<200) {
  if (w3c) {
  mtmp=document.getElementById("Mx"+(m_copo[ycol]-101)+"y"+ycol);
  mtmp.firstChild.nodeValue=String.fromCharCode(160);
  mtem=document.getElementById("Mx"+(100+rows-m_copo[ycol]--)+"y"+ycol);
  mtem.firstChild.nodeValue=String.fromCharCode(160);
  }
  else {
  mtmp=document.all["Mx"+(m_copo[ycol]-101)+"y"+ycol];
  mtmp.innerHTML=String.fromCharCode(160);
  mtem=document.all["Mx"+(100+rows-m_copo[ycol]--)+"y"+ycol];
  mtem.innerHTML=String.fromCharCode(160);
  }
  setTimeout("zoomer("+ycol+")", speed);
 }
}

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is there a way to change the background to an image so I could center a logo and have the effect over the top?