Using Array Join for String Concantenation
<p>Attempting using Array.join for string concatenation, but the following is causing FF to choke:</p>

<pre><code>var tmp = ["disco","dance"];
for (i = 0; i&lt;tmp.length; i++) {
  tmp.push(piece);
  alert(tmp[i]);
}
str = tmp.join(''); 
return str;
</code></pre>

<p>Would someone enlighten my usage?</p>
