JVS simple matrix effect

Pure javascript matrix-effect srcipt.It doesn't look like original, because it requires CSS knowledge and I'm trying to create simlpe, easily understand-able codes:)

<!DOCTYPE html>
<html>
<head>
<title>Cracked</title>
</head>
 <body>
  <script>
   i=0;
   q=0;
   var space="&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;";
   var down="<br/>"+"<br/>"+"<br/>"+"<br/>"+"<br/>";
   timer=setInterval(function first(){
    var secnumber=Math.floor(Math.random()*9);
    var thinumber=Math.floor(Math.random()*9);
    var founumber=Math.floor(Math.random()*9);
    var number=Math.floor(Math.random()*9);
    c=i++;document.bgColor="black";document.fgColor="green";document.write(number+space+founumber+space+thinumber+space+secnumber+space+thinumber+space+number+space+founumber+space+number+space+secnumber+space+thinumber+space+founumber+space+number+space+secnumber+space+number+space+founumber+space+thinumber+space+number+space+secnumber+space+thinumber+space+founumber+space+number+space+thinumber+space+founumber+space+secnumber+space+number+"<br/>");
    if(c==44){clearInterval(timer); document.body.innerHTML="";}
   },50);
         timers=setInterval(function(){if(c==44){
         var ranumber=Math.floor(Math.random()*9);
         a=q++;
         document.write(ranumber + " ");
         if(a==104||a==208||a==312||a==416||a==520||a==624||a==728||a==832||a==936){document.write(down);}
         if(a>935){location.reload(true);}
   }},0);
   </script>
  </body>
</html>