jquery.getScript.js

// Helps with IE debugging.
jQuery.extend({
	getScript: function(url, callback) {
		var head	= document.getElementsByTagName("head")[0];
		var script	= document.createElement("script");
		var done 	= false; // Handle Script loading
		
		script.src	= url;
		script.onload = script.onreadystatechange = function() { // Attach handlers for all browsers
			if ( !done && (!this.readyState || this.readyState === "loaded" || this.readyState === "complete") ) {
				done = true;
				if (callback) { callback(); }
				script.onload = script.onreadystatechange = null; // Handle memory leak in IE
			}
		};

		head.appendChild(script);		
		return undefined; // We handle everything using the script element injection
	}
});