Check for jQuery and add it if needed

jq_check.js

var hasjQuery = false;
jQueryCheck = function() {
	if (! window.jQuery) {
		if (! hasjQuery) {
			hasjQuery = true;
			var script = document.createElement('script');
			script.type = 'text/javascript';
			script.src = 'https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js';
			document.getElementsByTagName('body')[0].appendChild(script);
		}
			setTimeout('jQueryCheck()', 50);
		} else {
			$(function() {
				//do $ stuff
		});
	}
}
jQueryCheck();