getInteractiveScript = function(){
		var i, script,
		  scripts = doc[STR_GET_BY_TAG]('script');
		for (i = scripts.length - 1; i > -1 && (script = scripts[i]); i--) {
			if (script.readyState === 'interactive') {
				return script;
			}
		}
	}
@hide
Goes through the array of files listed in this.options.has, marks them all as loaded.  
This is used for files like production.css, which, once they load, need to mark the files they 
contain as loaded.