If, on the other hand, the script 930 a or 930 b is in an iframe 920 a or 920 b, such as shown in FIG. 9B, a second Javascript attribute, ???document.referrer???, is used to identify the location (URLMP) 915??? of the main Web page 900???, instead of returning the URLIF1 925 a??? or URLIF2 925 b??? of the iframe.