parseQueryString.js

function parseQueryString(altStr) {
	var s = altStr || window.location.search.substring(1)
	,   p = s.split("&")
	,   t = []
	,   q = {}
	,   i = 0
	;
	
	for(i = 0; i < p.length; i++) {
	    t = p[i].split("=");
	    q[decodeURIComponent(t[0])] = (t[1]) ? decodeURIComponent(t[1]) : null;
	}
	return q;
}