Added change element

Allows users to change the content of any element to a hidden element
<button class="button" onClick="replaceContentInContainer('popup2', 'rep_place1')">CH1</button>
<button class="button" onClick="replaceContentInContainer('popup2', 'rep_place2')">CH2</button>
<button class="button" onClick="replaceContentInContainer('popup2', 'rep_place3')">CH3</button>

<td id="popup2"> 
Click a Channel and enjoy!
<button class="button" onClick="replaceContentInContainer('popup2', 'rep_place1')">CH1</button>
<button class="button" onClick="replaceContentInContainer('popup2', 'rep_place2')">CH2</button>
<button class="button" onClick="replaceContentInContainer('popup2', 'rep_place3')">CH3</button>
</td>

    <div id="replacements"style="display:none">
      <span id="rep_place1">New content here!
	  </span>
    </div> 
    <div id="replacements"style="display:none">
      <span id="rep_place2">New content here!
	  </span>
    </div> 
    <div id="replacements"style="display:none">
      <span id="rep_place3">New content here!
	  </span>
    </div>