plugin question

plugin question

I'm new to JQuery and creating plugins

Here is my plugin code:

(function($) {
   $.fn.myPlugin= function(options){
      var defaults = {
         
      };
      var options = $.extend(defaults,options);
      return this.each(function(){
         obj = $(this);
         var listItems = $("li", obj);   
      });
   };
})(jQuery);


and here is my HTML:

<div class="pluginStyle">
    <li title="">list 1</li>
    <li title="">list 2</li>
    <li title="">list 3</li>
</div>



in the plugin, how would I check the number between each list tag and set it as a title attribute so i would end up with this:

<div class="pluginStyle">
    <li title="1">list 1</li>
    <li title="2">list 2</li>
    <li title="3">list 3</li>
</div>


I know i don't need a plugin to do this, but I will eventually have to have this functionality in the plugin

thanks