/* Copyright (c) 2006 Mathias Bank (http://www.mathias-bank.de)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) 
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
* 
* Thanks to Hinnerk Ruemenapf - http://hinnerk.ruemenapf.de/ for bug reporting and fixing.
*/
jQuery.extend({
    /**
    * Returns get parameters.
    *
    * If the desired param does not exist, null will be returned
    *
    * @example value = $.getURLParam("paramName");
    */
    getURLParam: function(strParamName) {
        var strReturn = "";
        var strHref = window.location.href;
        var bFound = false;

        var cmpstring = strParamName + "=";
        var cmplen = cmpstring.length;

        if (strHref.indexOf("?") > -1) {
            var strQueryString = strHref.substr(strHref.indexOf("?") + 1);
            var aQueryString = strQueryString.split("&");
            for (var iParam = 0; iParam < aQueryString.length; iParam++) {
                if (aQueryString[iParam].substr(0, cmplen) == cmpstring) {
                    var aParam = aQueryString[iParam].split("=");
                    strReturn = aParam[1];
                    bFound = true;
                    break;
                }

            }
        }
        if (bFound == false) return null;
        return strReturn;
    }
});