是否可以在没有GET的情况下获取哪个选项卡加载ajax页面？

very easy example:

<div id="tabs">
  <ul>
    <li><a href="tab_index.php" id="ctx-1">Tab 1</a></li>
    <li><a href="tab_index.php" id="ctx-5">Tab 2</a></li>
  </ul>
  <div class="tabs-spacer" style="height:0px"></div>
</div>

And now the problem: I'd like to know which tab "calls" tab_index.php.

The easiest solution would be: tab_index.php?ctx=1, but i don't want to use GET for security reasons.

Is is possible at all?

the Fiddle: http://jsfiddle.net/Sledgehammer/M8jYA/

If you don't want to use GET, you could use POST:

<div id="tabs">
  <ul>
      <li>
          <form action="tab_index.php" method="POST">
              <input type="submit" value="Tab1" name="tab" />
          </form>
      </li>
      <li>
          <form action="tab_index.php" method="POST">
              <input type="submit" value="Tab2" name="tab" />
          </form>
      </li>
  </ul>
  <div class="tabs-spacer" style="height:0px"></div>
</div>

Demo: http://jsfiddle.net/KTmga/ (check your browser's network console)

You could bind the click on your tab link $('a[href="tab_index.php"]')

$(function() {
    $('a[href="tab_index.php"]').click(function(){
       var clickedTab = $(this).attr("id"));
    });
});

jsFiddle example - http://jsfiddle.net/Zdw37/6/