/* 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,source){

	  var strReturn = "";

	  if(source) {
	   var strHref = source;
	  } else {
	   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;
	}
});