Processing function under onMouseOver_html/css_WEB-ITnose-HTML Tutorial-php.cn

Processing function under onMouseOver_html/css_WEB-ITnose

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Release： 2016-06-24 12:16:10

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<div id="channelmenu">	<a href="index.php" target="_self" class="channelmenu_main" id="channelmenu_main_0" onMouseOver="showSubMenu('channelmenu_main','channelmenu_sub',0)">网站首页</a><div id="menuright" style="float:left;height:27px;width:2px;margin-right:5px;background:url(menu/templates/images/channelmenu_diy/li.gif) no-repeat;"></div>	<a href="page/html/company.php" target="_self" class="channelmenu_main" id="channelmenu_main_1" onMouseOver="showSubMenu('channelmenu_main','channelmenu_sub',1)">关于我们</a><div id="menuright" style="float:left;height:27px;width:2px;margin-right:5px;background:url(menu/templates/images/channelmenu_diy/li.gif) no-repeat;"></div>	<a href="news/class/?104.html" target="_self" class="channelmenu_main" id="channelmenu_main_2" onMouseOver="showSubMenu('channelmenu_main','channelmenu_sub',2)">服务领域</a><div id="menuright" style="float:left;height:27px;width:2px;margin-right:5px;background:url(menu/templates/images/channelmenu_diy/li.gif) no-repeat;"></div>	<a href="page/solution/?83.html" target="_self" class="channelmenu_main" id="channelmenu_main_3" onMouseOver="showSubMenu('channelmenu_main','channelmenu_sub',3)">解决方案</a><div id="menuright" style="float:left;height:27px;width:2px;margin-right:5px;background:url(menu/templates/images/channelmenu_diy/li.gif) no-repeat;"></div>	<a href="news/class/?86.html" target="_self" class="channelmenu_main" id="channelmenu_main_4" onMouseOver="showSubMenu('channelmenu_main','channelmenu_sub',4)">新闻动态</a><div id="menuright" style="float:left;height:27px;width:2px;margin-right:5px;background:url(menu/templates/images/channelmenu_diy/li.gif) no-repeat;"></div>	<a href="page/case/case.php" target="_self" class="channelmenu_main" id="channelmenu_main_5" onMouseOver="showSubMenu('channelmenu_main','channelmenu_sub',5)">成功案例</a><div id="menuright" style="float:left;height:27px;width:2px;margin-right:5px;background:url(menu/templates/images/channelmenu_diy/li.gif) no-repeat;"></div>	<a href="page/feedback/feedback.php" target="_self" class="channelmenu_main" id="channelmenu_main_6" onMouseOver="showSubMenu('channelmenu_main','channelmenu_sub',6)">需求反馈</a><div id="menuright" style="float:left;height:27px;width:2px;margin-right:5px;background:url(menu/templates/images/channelmenu_diy/li.gif) no-repeat;"></div>	<a href="page/contact/contact.php" target="_self" class="channelmenu_main" id="channelmenu_main_7" onMouseOver="showSubMenu('channelmenu_main','channelmenu_sub',7)">联系方式</a><div id="menuright" style="float:left;height:27px;width:2px;margin-right:5px;background:url(menu/templates/images/channelmenu_diy/li.gif) no-repeat;"></div>

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The processing function showSubMenu() under onMouseOver
Why can’t I find the place where this function is defined in the javascript code of the page?
Or this function has been defined by the system of? Just call it directly? Asking for detailed advice from experts. Waiting online. Bonus points as appropriate