overlay show\hide effect
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<td class="paramSpacer">&nbsp;</td>
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<td width="20px"></td><td><code><span class="label">xLocation</span>:Number</code> &mdash;  position of the x-button that closes the ad. 
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<a name="methodDetail"></a>
<div class="detailSectionHeader">Method detail</div>
<a name="addXButton()"></a>
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<td class="detailHeaderName">addXButton</td><td class="detail