553023 Wordpress Admin Dashboard HTML Tab

We would like to remove the Wordpress Admin Dashboard HTML Tab. Please see attached image for additional clarification. What we need is from the programmer is to tell us which file in the wp-admin contains the codes. All we are looking for is the file path that will take away the tab. Please see code below. <div id="postdivrich" class="postarea"> <div id="editor-toolbar"> <div class="zerosize"><input accesskey="e" type="button" onclick="[login to view URL]('content')" /></div> <a id="edButtonHTML" class="active hide-if-no-js" onclick="[login to view URL]('content', 'html');">HTML</a> <a id="edButtonPreview" class="hide-if-no-js" onclick="[login to view URL]('content', 'tinymce');">Visual</a> We would like to remove following code: <a id="edButtonHTML" class="active hide-if-no-js" onclick="[login to view URL]('content', 'html');">HTML</a>