/* 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;
        }
    });