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Dynamically Loading JQuery form an externally linked to JavaScript file
if (typeof jQuery == 'undefined') {
  //alert('No jQuery! Will attempt to load it now');
  var script = document.createElement('script');
  script.type = "text/javascript";
  script.src = "http://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js";
  document.getElementsByTagName('head')[0].appendChild(script);
  tryReady = function(time_elapsed) {
    if (typeof jQuery == "undefined") { // if jQuery isn't loaded yet...
      if (time_elapsed <= 100000) { // and we havn't given up trying...
        setTimeout("tryReady(" + (time_elapsed + 200) + ")", 200); // set a timer to check again in 200 ms.
      } else {
        alert('hello'); // If this isn't here, the subsequent scripts fail to access jQuery
      }
    } else {
      //alert ("jQuery wasn't but now is loaded")
    }
  }
  tryReady();
}
  // Functions making use of jQuery go here...

if (typeof jQuery == 'undefined') {
  var script = document.createElement('script');
  script.type = "text/javascript";
  script.src = "http://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js";
  script.onload = function(){
    alert('voila');
  }
  document.getElementsByTagName('head')[0].appendChild(script);
}