GET Request Parameter with JavaScript

I found an easy method to get url parameters with JavaScript. The beauty is that it uses a JavaScript closure to cache the values so that it can be called multiple times without unneeded processing:

var urlParameter = (function() {
    var parameters = undefined;
    return function (paramName) {
        if (parameters == undefined) {
            parameters = {};
            var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
            for (var i = 0; i < hashes.length; i++) {
                hash = hashes[i].split('=');
                parameters[hash[0]] = hash[1];
            }
        }
        return parameters[paramName];
    }
}());

Usage:

urlParameter(parameterName);

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