public/javascripts/yui/history/history-debug.js
function (paramName, url) {

            var i, len, idx, queryString, params, tokens;

            url = url || top.location.href;

            idx = url.indexOf("?");
            queryString = idx >= 0 ? url.substr(idx + 1) : url;

            // Remove the hash if any
            idx = queryString.lastIndexOf("#");
            queryString = idx >= 0 ? queryString.substr(0, idx) : queryString;

            params = queryString.split("&");

            for (i = 0, len = params.length; i < len; i++) {
                tokens = params[i].split("=");
                if (tokens.length >= 2) {
                    if (tokens[0] === paramName) {
                        return unescape(tokens[1]);
                    }
                }
            }

            return null;
        }
function (paramName, url) {

            var i, len, idx, queryString, params, tokens;

            url = url || top.location.href;

            idx = url.indexOf("?");
            queryString = idx >= 0 ? url.substr(idx + 1) : url;

            // Remove the hash if any
            idx = queryString.lastIndexOf("#");
            queryString = idx >= 0 ? queryString.substr(0, idx) : queryString;

            params = queryString.split("&");

            for (i = 0, len = params.length; i < len; i++) {
                tokens = params[i].split("=");
                if (tokens.length >= 2) {
                    if (tokens[0] === paramName) {
                        return unescape(tokens[1]);
                    }
                }
            }

            return null;
        }
function ( paramName , url ) { var i , len , idx , queryString , params , tokens ; url = url || top . location . href ; idx = url . indexOf ( "?" ) ; queryString = idx >= 0 ? url . substr ( idx + 1 ) : url ; // Remove the hash if any idx = queryString . lastIndexOf ( "#" ) ; queryString = idx >= 0 ? queryString . substr ( 0 , idx ) : queryString ; params = queryString . split ( "&" ) ; for ( i = 0 , len = params . length ; i < len ; i ++ ) { tokens = params [ i ] . split ( "=" ) ; if ( tokens . length >= 2 ) { if ( tokens [ 0 ] === paramName ) { return unescape ( tokens [ 1 ] ) ; } } } return null ; }
Returns the value of the specified query string parameter.
This method is not used internally by the Browser History Manager.
However, it is provided here as a helper since many applications
using the Browser History Manager will want to read the value of
url parameters to initialize themselves.

@method getQueryStringParameter
@param {string} paramName Name of the parameter we want to look up.
@param {string} queryString Optional URL to look at. If not specified,
this method uses the URL in the address bar.
@return {string} The value of the specified parameter, or null.
@public
Returns the value of the specified query string parameter . This method is not used internally by the Browser History Manager . However it is provided here as a helper since many applications using the Browser History Manager will want to read the value of url parameters to initialize themselves .