/* Copyright (c) 2006-2007 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.
*
* Version 2.1
*
* Thanks to
* Hinnerk Ruemenapf - http://hinnerk.ruemenapf.de/ for bug reporting and fixing.
* Tom Leonard for some improvements
*
*/
jQuery.fn.extend({
/**
* Returns get parameters.
*
* If the desired param does not exist, null will be returned
*
* To get the document params:
* @example value = jQuery(document).getUrlParam("paramName");
*
* To get the params of a html-attribut (uses src attribute)
* @example value = jQuery('#imgLink').getUrlParam("paramName");
*/
getUrlParam: function(strParamName){
     strParamName = escape(unescape(strParamName));
         var returnVal = new Array();
     var qString = null;
         if (jQuery(this).attr("nodeName")=="#document") {
         //document-handler
             if (window.location.search.search(strParamName) > -1 ){
                     qString = window.location.search.substr(1,window.location.search.length).split("&");
       }
               } else if (jQuery(this).attr("src")!="undefined") {
                 var strHref = jQuery(this).attr("src")
         if ( strHref.indexOf("?") > -1 ){
           var strQueryString = strHref.substr(strHref.indexOf("?")+1);
             qString = strQueryString.split("&");
         }
     } else if (jQuery(this).attr("href")!="undefined") {
                 var strHref = jQuery(this).attr("href")
         if ( strHref.indexOf("?") > -1 ){
           var strQueryString = strHref.substr(strHref.indexOf("?")+1);
             qString = strQueryString.split("&");
         }
     } else {
         return null;
     }
                 if (qString==null) return null;
             for (var i=0;i<qString.length; i++){
           if (escape(unescape(qString[i].split("=")[0])) == strParamName){
               returnVal.push(qString[i].split("=")[1]);
           }
               }
             if (returnVal.length==0) return null;
     else if (returnVal.length==1) return returnVal[0];
     else return returnVal;
   }
});