Get value from string parameter of JavaScript function
<p>In the following standard function you can put in multiple arguments for the second and third parameter. </p>

<pre><code>var retval = window.showModalDialog(dialog, varArgIn, varOptions);
</code></pre>

<p>The varOptions parameter can be filled with:</p>

<pre><code>'dialogHeight:580px;dialogWidth:700px;center=yes;scroll=no', 
</code></pre>

<p>How do I get the only the value that's set at dialogHeight? So I can re-use only that value somewhere else. </p>
