gistfile1.txt

var scripts = [];
var src;
var script;
var pendingScripts = [];
var firstScript = document.scripts[0];

function stateChange() {
  var pendingScript;
  while (pendingScripts[0] && pendingScripts[0].readyState == 'loaded') {
    pendingScript = pendingScripts.shift();
    pendingScript.onreadystatechange = null;
    firstScript.parentNode.insertBefore(pendingScript, firstScript);
  }
}
while (src = scripts.shift() ) {
  if ( 'async' in firstScript ) {
    script = document.createElement('script');
    script.async = false;
    script.src = src;
    document.head.appendChild(script);
  }
  else if ( firstScript.readyState ) { 
    script = document.createElement('script');
    pendingScripts.push(script);
    script.onreadystatechange = stateChange;
    script.src = src;
  }
}