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I've noted some details, let me explain:

1. CSS Selectors. jQuery allows you to use them too:

   $("[id^='content-wrap']") --> will select all elements which id starts with 'content-wrap'

2. Substring is an available method of JavaScript:

   var number = "navItem15".substring(7); // will return what is after position 7.. // resulting the number "15"

3. To start your menu with the first position. This is the best way:

   (function(){ $("#navItem1").trigger("click"); })(); // using this approach, you won't need copy your code into a function as you did // this approach triggers the "click" event in the first menu automatically

Well, hope you got it!

Nice coding!