How to change tags on a web page using mechanize

I am using mechanize to interact with a website. The website is a search engine with different channels such as knowledge, book, journal and newspaper. Some of the code like this:

<UL>
   <LI id=me_0_1 style="DISPLAY: none; FONT-WEIGHT: bold;">
       <A style="width:30px;text-decoration:none;">
           <FONT color=#000000>**Knowledge**</FONT>
       </A>
   </LI>
   <LI id=me_0 style="DISPLAY: block;height:20px;width:30px;">
       <A onClick="change_Tag('me_0','goqw.jsp','');" href="#" style="width:30px;">**Knowledge**</A>
   </LI>
   <LI id=me_1_1 style="DISPLAY: none; FONT-WEIGH开发者_JAVA百科T: bold;">
      <A style="width:30px;text-decoration:none;">
          <FONT color=#000000>**Book**</FONT>
      </A>
   </LI>
   <LI id=me_1 style="DISPLAY: block;height:20px;width:30px;">
      <A onClick="change_Tag('me_1','search','searchFBook');" href="#" style="width:30px;">**Book**</A>
   </LI>
   <LI id=me_2_1 style="DISPLAY: none; FONT-WEIGHT: bold;">
      <A style="width:30px;text-decoration:none;">
          <FONT color=#000000>**Journal**</FONT>
      </A>
   </LI>
   <LI id=me_2 style="DISPLAY: block;height:20px;width:30px;">
      <A onClick="change_Tag('me_2','searchJour','searchFJour');" href="#" style="width:30px;">**Journal**</A>
   </LI>
</UL>

How to switch between these tags in mechanize? Many thanks!

You need to sniff what's happening inside the change_Tag function. Open its sources and look for AJAX-requests, redirects, script tag insections. After that just send the appropriate request using Mechanize.