How to serialize a Object into a list of parameters?
<p>Without knowing the keys of a JavaScript <code>Object</code>, how can I turn something like...</p>

<pre><code>var obj = {
   param1: 'something',
   param2: 'somethingelse',
   param3: 'another'
}

obj[param4] = 'yetanother';
</code></pre>

<p>...into...</p>

<pre><code>var str = 'param1=something&amp;param2=somethingelse&amp;param3=another&amp;param4=yetanother';
</code></pre>

<p>...?</p>
