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function resize()
var ht = window.innerHeight;
var h = document.getElementById("header").clientHeight;
var f = document.getElementById("footer").clientHeight;

var sum = ht-h-f;

document.getElementsByClassName("main")[0].style.height = sum+'px';


There's no reason to change it, if it works.

In jQuery, to get elements by ID do:

To get elements by class use a . instead of a #.


There's lots of tutorials online as well if you just google the specific thing you need.
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Try this

$(function () {
          alert('page load');
          var ht = window.innerHeight;
          var h = $('#header')[0].clientHeight;
          var f = $('#footer')[0].clientHeight;

          var sum = ht - h - f;

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