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    copied!<p>you neglected to close your opening <code>&lt;table&gt;</code> and <code>&lt;button&gt;</code> tags. when making the function call just pass <code>this</code> in parens and pull the id out in the function. then update the innards of your button to X. if you want to swap the out for a X you will have to access the parentNode and then update the parent's innerHTML</p> <pre><code>&lt;table id="tictable" border="1"&gt; &lt;tr id="row1"&gt; &lt;td&gt;&lt;button id="button1" type="button" onclick="actionPerformed(this)"&gt;&amp;nbsp;&lt;/button&gt;&lt;/td&gt; &lt;td&gt;&lt;button id="button2" type="button" onclick="actionPerformed(this)"&gt;&amp;nbsp;&lt;/button&gt;&lt;/td&gt; &lt;td&gt;&lt;button id="button3" type="button" onclick="actionPerformed(this)"&gt;&amp;nbsp;&lt;/button&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr &gt; &lt;td&gt;&lt;button id="button4" type="button" onclick="actionPerformed(this)"&gt;&amp;nbsp;&lt;/button&gt;&lt;/td&gt; &lt;td&gt;&lt;button id="button5" type="button" onclick="actionPerformed(this)"&gt;&amp;nbsp;&lt;/button&gt;&lt;/td&gt; &lt;td&gt;&lt;button id="button6" type="button" onclick="actionPerformed(this)"&gt;&amp;nbsp;&lt;/button&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr id="row3"&gt; &lt;td&gt;&lt;button id="button7" type="button" onclick="actionPerformed(this)"&gt;&amp;nbsp;&lt;/button&gt;&lt;/td&gt; &lt;td&gt;&lt;button id="button8" type="button" onclick="actionPerformed(this)"&gt;&amp;nbsp;&lt;/button&gt;&lt;/td&gt; &lt;td&gt;&lt;button id="button9" type="button" onclick="actionPerformed(this)"&gt;&amp;nbsp;&lt;/button&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;script type="text/javascript"&gt; function actionPerformed(domObj) { domObj.innerHTML = "X"; } &lt;/script&gt; </code></pre> <p>i just copied this into a jsfiddle and it worked</p>
 

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