/* 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 = $(document).getUrlParam("paramName");
     * 
     * To get the params of a html-attribut (uses src attribute)
     * @example value = $('#imgLink').getUrlParam("paramName");
     */ 
getUrlParam: function(strParamName){
strParamName = escape(unescape(strParamName));

var returnVal = new Array();
var qString = null;

if ($(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 ($(this).attr("src")!="undefined") {

  var strHref = $(this).attr("src")
    if ( strHref.indexOf("?") > -1 ){
      var strQueryString = strHref.substr(strHref.indexOf("?")+1);
      qString = strQueryString.split("&");
    }
} else if ($(this).attr("href")!="undefined") {

  var strHref = $(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;
}
});