Jquery for making DIV visible/invisible

jQuery's .show() and .hide() methodswill allow you to accomplish your goal.

$( 'your_selector' ).click( function() {
    $( '#application_1' ).hide();
    $( '#application_2' ).show();
});

Assuming the div elements already exist on the page and you are just toggling their visibility:

$('#Application1').click(function() {
  $('#Application1Div').show();
  $('#Application2Div').hide();
});
$('#Application2').click(function() {
  $('#Application2Div').show();
  $('#Application1Div').hide();
});

Here is a real basic example: http://jsfiddle.net/YBABG/1/

<div class="parentNode a1">Application 1
    <div class="childNode">Information</div>
</div>
<div class="parentNode a2">Application 2
    <div class="childNode">Information</div>
</div>


$(".childNode").hide();

$(".parentNode").click(function(){
   $(".childNode").hide(100);
   $(this).children().show(100);
});

Specifying a duration in hide will create a simple animated effect.

Here

improved DEMO

HAVE FUN & Happy coding!