$(document).ready(function() {
   // Calculate the window's height
   var windowsize = ($(window).height());
   var contentsize = ($('#main').height());
   var contentfloatsize = ($('#main-float').height());
   var headersize = 50;
   var footersize = 165;
   var spacesize = 30;
   
   // Set the initial height values for the divs
   $('#stretch').height(windowsize-headersize-footersize-spacesize-contentsize-contentfloatsize);                            
   
   // Event listener. On Window's resize, apply the new window's height.
   $(window).resize(function() {
       var windowsize = ($(window).height());
       $('#stretch').height(windowsize-headersize-footersize-spacesize-contentsize-contentfloatsize);  
   });
});