Parse (and cache) the query string and return the requested search value

getQuery.js

function getQuery(search) {
	if (!getQuery.parsed) {
		var match, key, value,
				rx = /([^=&]+)(?:=([^&]*))?/g,
				parsed = getQuery.parsed = {};

		while ((match = rx.exec(document.location.search.substring(1)))) {
			key = decodeURIComponent(match[1]);
			value = match[2] === undefined ? true : decodeURIComponent(match[2]);
			if (parsed.hasOwnProperty(key)) {
				if (!Array.isArray(parsed[key])) {
					parsed[key] = [parsed[key]];
				}
				parsed[key].push(value);
			} else {
				parsed[key] = value;
			}
		}
	}
	return getQuery.parsed[search];
}