JQuery: Getting current height of element and adding height

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Hi All,

On this page: https://webform.bd.com/csdb/

How do I get the current height of the Main div tag and add 1000 to it? Same goes true for subtracting 1000 if someone wants to remove a license.

This is the JQuery that I am using to add/remove additional licenses:

<script type="text/javascript">

$(document).ready(function()
	{
  		$("#AddL2").click(function(){
   		$("#License2").slideDown("fast");
	
});
  

  $("#RemL2").click(function(){
    $("#License2").slideUp("fast");
	
  });
  
    $("#AddL3").click(function(){
    $("#License3").slideDown("fast");
	
  });
  
    $("#RemL3").click(function(){
    $("#License3").slideUp("fast");
	
});
  
});
</script>

If you add a license and scroll all the way to the bottom, you can see the "Main" div tag doesn't adjust to the added license.