diff --git a/stickyheader.jquery.js b/stickyheader.jquery.js
index b82272d..47569c5 100644
--- a/stickyheader.jquery.js
+++ b/stickyheader.jquery.js
@@ -1,48 +1,85 @@
+const STICK_HEADER = {
+  run: function () {
+    var $tables = $('table.stickyHeader');
+
+    $tables.each(function (i) {
+      var table = $tables[i];
+      var bodyHeight, cutoffTop, cutoffBottom, tableHeight, tableWidth;
+
+      var tableClone = $(table).clone(true).empty().removeClass('stickyHeader');
+      var theadClone = $(table).find('thead').clone(true);
+      var stickyHeader =  $('<div></div>').addClass('stickyHeader hide').attr('aria-hidden', 'true');
+      stickyHeader.append(tableClone).find('table').append(theadClone);
+      $(table).after(stickyHeader);
+
+      var headerCells = $(table).find('thead th');
+      var headerCellHeight = $(headerCells[0]).height();
+
+      var noFixedSupport = (stickyHeader.css('position') === 'absolute');
+
+      var stickyHeaderCells = stickyHeader.find('th');
+
+      function evaluateHeaderPositionAndSize() {
+        bodyHeight = $('body').height()
+        tableHeight = $(table).height();
+        tableWidth = $(table).width() +
+                     Number($(table).css('padding-left').replace(/px/ig,"")) +
+                     Number($(table).css('padding-right').replace(/px/ig,"")) +
+                     Number($(table).css('border-left-width').replace(/px/ig,"")) +
+                     Number($(table).css('border-right-width').replace(/px/ig,""));
+        cutoffTop = $(table).offset().top;
+        cutoffBottom = tableHeight + cutoffTop - headerCellHeight;
+
+        for (var i = 0, l = headerCells.length; i < l; i++) {
+          if (headerCells[i].style.width.length > 0) {
+            // This takes into account other scripts that set header width
+            // such as DataTables
+            stickyHeaderCells[i].style.width = headerCells[i].style.width
+          } else {
+            stickyHeaderCells[i].style.width = headerCells[i].scrollWidth + 'px'
+          }
+        }
+
+        stickyHeader.css('width', tableWidth);
+      }
+
+      function setClassNames() {
+        for (var i = 0; i < stickyHeader.find('th').length; i++) {
+          stickyHeader.find('th')[i].className = $(table).find('thead th')[i].className
+        }
+      }
+
+      evaluateHeaderPositionAndSize()
+
+      window.onresize = function () {
+        evaluateHeaderPositionAndSize()
+      }
+
+      // Sometimes header class names change when clicked
+      // such as with dataTables sorting
+      $(table).find('th').click(setClassNames)
+      stickyHeader.find('th').click(setClassNames)
+
+      $(window).scroll(function() {
+        if (bodyHeight !== $('body').height()) {
+          evaluateHeaderPositionAndSize()
+        }
+
+        var currentPosition = $(window).scrollTop();
+        if (currentPosition > cutoffTop && currentPosition < cutoffBottom) {
+          stickyHeader.removeClass('hide');
+          if (noFixedSupport) {
+            stickyHeader.css('top', currentPosition + 'px');
+          }
+        }
+        else {
+          stickyHeader.addClass('hide');
+        }
+      });
+    });
+  }
+}
+
 jQuery(document).ready(function ($) {
-	var tables = $('table.stickyHeader');
-	tables.each(function(i){
-		var table = tables[i];
-		var tableClone = $(table).clone(true).empty().removeClass('stickyHeader');
-		var theadClone = $(table).find('thead').clone(true);
-		var stickyHeader =  $('<div></div>').addClass('stickyHeader hide').attr('aria-hidden', 'true');
-		stickyHeader.append(tableClone).find('table').append(theadClone);
-		$(table).after(stickyHeader);
-		
-		var tableHeight = $(table).height();
-		var tableWidth = $(table).width() + Number($(table).css('padding-left').replace(/px/ig,"")) + Number($(table).css('padding-right').replace(/px/ig,"")) + Number($(table).css('border-left-width').replace(/px/ig,"")) + Number($(table).css('border-right-width').replace(/px/ig,""));
-		
-		var headerCells = $(table).find('thead th');
-		var headerCellHeight = $(headerCells[0]).height();
-		
-		var no_fixed_support = false;
-		if (stickyHeader.css('position') == "absolute") {
-			no_fixed_support = true;
-		}
-		
-		var stickyHeaderCells = stickyHeader.find('th');
-		stickyHeader.css('width', tableWidth);
-		var cellWidths = [];
-		for (var i = 0, l = headerCells.length; i < l; i++) {
-			cellWidths[i] = $(headerCells[i]).width();
-		}
-		for (var i = 0, l = headerCells.length; i < l; i++) {
-			$(stickyHeaderCells[i]).css('width', cellWidths[i]);
-		}
-		
-		var cutoffTop = $(table).offset().top;
-		var cutoffBottom = tableHeight + cutoffTop - headerCellHeight;
-		
-		$(window).scroll(function() { 
-		var currentPosition = $(window).scrollTop();
-			if (currentPosition > cutoffTop && currentPosition < cutoffBottom) {
-				stickyHeader.removeClass('hide');
-				if (no_fixed_support) {
-					stickyHeader.css('top', currentPosition + 'px');
-				}
-			}
-			else {
-				stickyHeader.addClass('hide');
-			}
-		});
-	});
+  STICK_HEADER.run()
 });