loadScript

		function loadScript(url,callback,args) {
		    scriptEl = document.createElement('script');
		    scriptEl.type = 'text/javascript';
		    scriptEl.async = true;
		    scriptEl.src = url;

		    if (typeof(callback) === 'function'){

		    	if ("onload" in scriptEl){
				    scriptEl.onload = function(){
				        // remote script has loaded
				        if (args){
				        	callback.apply(null,args);
				        } else {
				        	callback.apply();
				        }
				    };    		
		    	} else {
		    		var r = false;
		            scriptEl.onreadystatechange = function() {
						if (!r && (!this.readyState || this.readyState === 'complete')) {
							r = true;
					        if (args){
					        	callback.apply(null,args);
					        } else {
					        	callback.apply();
					        }
						}
		            };
				}
		    }	    	
		    document.getElementsByTagName('head')[0].appendChild(scriptEl);
		}