javascript - Finding nth div of a certain class with .eq -

i have following html

<div id="mydiv">    <div class="myclass">test1</div>   <div class="myclass">test2</div>   <div class="myclass">test3</div>   <div class="myclass">test4</div>  </div> 

i'm trying use jquery eq function , far have this:

function(theindex) {   alert( ('.myclass').eq(theindex).html() ); }; 

i'm getting error in chrome

uncaught typeerror: object .myclass has no method 'eq'

what doing wrong?

thanks suggestions.

function(theindex) {     alert( $('.myclass').eq(theindex).html() ); }; 

remember index going 0 based, too...