Add CSS z-index property to css variable in JQuery
<p>I am trying to add css property to my css variable in Jquery.</p>

<pre><code>var cssProp = {
    'position': 'absolute',
    'top': topPos,
    'left': leftPos
}

//this codes works
cssProp.top += 10;

//this is not..
cssProp.z - index = 10;
</code></pre>

<p>How to fix this? Thanks a lot!</p>
