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Loading Scripts without Blocking

/ Published in: JavaScript
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Copy this code and paste it in your HTML 
  1. function loadScript(url, callback){
  2.  
  3.     var script = document.createElement("script")
  4.     script.type = "text/javascript";
  5.  
  6.     if (script.readyState){  //IE
  7.         script.onreadystatechange = function(){
  8.             if (script.readyState == "loaded" ||
  9.                     script.readyState == "complete"){
  10.                 script.onreadystatechange = null;
  11.                 callback();
  12.             }
  13.         };
  14.     } else {  //Others
  15.         script.onload = function(){
  16.             callback();
  17.         };
  18.     }
  19.  
  20.     script.src = url;
  21.     document.getElementsByTagName("head")[0].appendChild(script);
  22. }

URL: http://www.nczonline.net/blog/2009/07/28/the-best-way-to-load-external-javascript/

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