Q:

Multi-level menu for an FAQ

I am making a FAQ that ask you 3 question to give you the correct answer. It works in the same way as this website: Nokia Lumia FAQ.
The code works. You have 3 level of content to see depending on the button you press. When a button is pressed on level 1, level 2 and level 3 it will change color so you end with three button that have changed color, its easier to understand in that way you wanted help for Example: Phone - Andriod - Simcard help.
Notice that level 1 and level 2 content have much simliar in the JS code, but level 3 is a bit different because there your browser scroll you down when the content is displayed. And also level 3 does have hyperlink instead of button.
I have to manually dublicate part of this JS code for adding new buttons, and i think there can be an easier way. I really appreciate any help.
Here is the JS:
$(document).ready(function(){

// Level 1
function show(sel) {
  var el = $(sel);
  el.fadeToggle();
  $('.showmore-1').not(el).fadeOut("slow");
}

$('.showmore-1').hide();

$('.click-1').click(function(){
    $('.click-1').removeClass('clickcolor')
        $(this).addClass('clickcolor');
});

$('#click-1a').click(function () {
  show('#showmore-1a');
});

$('#click-1b').click(function () {
  show('#showmore-1b');
});

$('#click-1c').click(function () {
  show('#showmore-1c');
});

// Level 2
function show(sel) {
  var el = $(sel);
  el.fadeToggle();
  $('.showmore-2').not(el).fadeOut("slow");
}

$('.showmore-2').hide();

$('.click-2').click(function(){
    $('.click-2').removeClass('clickcolor')
        $(this).addClass('clickcolor');
});

$('#click-2a').click(function () {
  show('#showmore-2a');
});

$('#click-2b').click(function () {
  show('#showmore-2b');
});

$('#click-2c').click(function () {
  show('#showmore-2c');
});

// Level 3
function show(sel) {
  var el = $(sel);
  el.fadeToggle();
  $('.showmore-3').not(el).fadeOut("slow");
}

$('.showmore-3').hide();

$('.click-3').click(function(){
    $('.click-3').removeClass('clickcolortext') //Level 3 display text instead of button to be pressed and therefore another class of color.
    $(this).addClass('clickcolortext');
});

$('#click-3a').click(function () {
  show('#showmore-3a');
  $('html, body').scrollTop($('#showmore-3a').offset().top);
  return false; 
});

$('#click-3b').click(function () {
  show('#showmore-3b');
  $('html, body').scrollTop($('#showmore-3b').offset().top);
  return false; 
});

$('#click-3c').click(function () {
  show('#showmore-3c');
  $('html, body').scrollTop($('#showmore-3c').offset().top);
  return false; 
});

});
enter code here

Here is a part of the HTML
<button class="click-1" id="click-1a">Mobile</button> 
<button class="click-1" id="click-1b">PC</button> 
<button class="click-1" id="click-1c">Tablet</button>

<div id="showmore-1a" class="showmore-1">View content for mobile help</div>
<div id="showmore-1b" class="showmore-1">View content for pc help</div>
<div id="showmore-1c" class="showmore-1">View content for tablet help</div>
enter code here

Here is the CSS
.clickcolor {
    background-color: #4d4d4d !important;
}

.clickcolortext {
    color: #4d4d4d !important;
}

A:

Add a target attribute on buttons:
<button class="click-1" id="click-1a" data-target="#showmore-1a">Mobile</button> 
<button class="click-1" id="click-1b" data-target="#showmore-1b">PC</button> 
<button class="click-1" id="click-1c" data-target="#showmore-1c">Tablet</button>

JS
$('button.click-1').click(function(){
      $('.click-1').removeClass('clickcolor')
      $(this).addClass('clickcolor');
      show($(this).data('target'));
});

