Boilerplate for jQuery-powered bookmarklet

snippet.js

(function(){
  var run=function(){
    // code here...
  };
  if(typeof jQuery=='undefined'){
    var s=document.createElement('script');
    s.src='http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.js';
    s.loaded=false;
    s.onload=function(){
      s.loaded=true;
      run();
    };
    s.onreadystatechange=function(){
      if('loaded'==s.readyState&&!s.loaded){
        s.onload();
      }
    };
    document.getElementsByTagName('head')[0].appendChild(s);
    jQuery.noConflict();
  }else{
    run();
  }
})();