Get an url-parameter from the current URL

get-url-parameter.js

var getUrlParameter = function(param) {
    var pageUrl = window.location.search.substring(1);
    var urlVariables = pageUrl.split('&');

    for (var i = 0; i < urlVariables.length; i++) {
        var parameterName = urlVariables[i].split('=');

        if (parameterName[0] == param) {
            return parameterName[1];
        }
    }
};