Okay, I've implemented your corrections. Here is the text engine (excluding the php ascii string which handles the line breaks) ---

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  var letter = 100;
  
  function alterText() {
      underscore = document.getElementById("n" + letter).innerHTML;
      
      if(underscore == "_") {
  	     document.getElementById("n" + letter).innerHTML=" ";
       } 
      else if(letter < 3450) {    
        document.getElementById("n" + letter).style.visibility="visible";
  	    document.getElementById("n" + letter++).style.color=genHex();	   
  	   }
  	  else
  	    return false;
  }

var letter = 100; function alterText() { underscore = document.getElementById("n" + letter).innerHTML; if(underscore == "_") { document.getElementById("n" + letter).innerHTML="&nbsp;"; } else if(letter < 3450) { document.getElementById("n" + letter).style.visibility="visible"; document.getElementById("n" + letter++).style.color=genHex(); } else return false; }

I guess this function is still getting called each 80ms or so, but if it's returning false, it should be okay? Please tell me it's working in IE. Thanks so much for your diligence in helping me out.

Edit: I think that I've got to use an extra number for the string length when using Math.floor(). I've tested it as such; otherwise it doesn't work.