error selecting div element with a particular id - beginner at jQuery, javascript

error selecting div element with a particular id - beginner at jQuery, javascript

Hi,
I am playing around with selecting elements in the DOM using jQuery, and I tried the following:
 
$(document).ready(function() {
      $("a").toggle(function(){
        $("div[@id=SomeID]").hide('slow');
        },function(){
        $("div[@id=SomeID]").show('fast');
       });



});
 
And in the html source, I do have this section:
<div id="SomeID">
      <!-- div code -->
</div>
 
However, when I click on an anchor tag I get the following error:
Syntax error, unrecognized expression: div[@id=SomeID]
 
Any ideas as to what is going wrong here? I'm a beginner at jQuery and javaScript, so would appreciate any help.