Get Parameters from QueryString

functions.js

function getParameters(qs) {
    qs = qs.split("+").join(" ");
    var params = {}, tokens,
        re = /[?&]?([^=]+)=([^&]*)/g;

    while (tokens = re.exec(qs)) {
        params[decodeURIComponent(tokens[1])]
            = decodeURIComponent(tokens[2]);
    }
    return params;
	/* Using:
	var query = getParameters(document.location.search);
	console.log(query.next)
	*/

}

String.prototype.format = function(){
	var pattern = /\{\d+\}/g;
	var args = arguments;
	return this.replace(pattern, function(capture){return args[capture.match(/\d+/)];});
};
String.prototype.contains = function(texto){
    return this.indexOf(texto) != -1;
};