JavaScript layer hiding and showing code_javascript skills

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>Layer hiding and display 2009-7-7</title> <style type="text/css"> #content1,#content2{ width:300px; height:200px; border:1px solid black; background:#cccccc; } #menu{ cursor:pointer; } </style> <span id="menu" onclick="doit()"> </span>More<div id="content1"> </div> I am more content inside <!--content1--><div id="content2" style="display:none;"> </div> I'm not more of what's inside <!--content2-->