how is this dropdown working ? on selection it displays another record.

this website here:

when you select a dropdown the record based on your selection is displayed. ive tried copying it to localhost and it wont work. ive also tryed reading its headers and cant seem to figure out how javascript is making the records display on selection. i do understand that its extension isnt really html and might be another but based on how its operating as a html file i cant seem to find anywhere on how its sending the string to show the records.

thanks

From stackoverflow

• it use jQuery + ASP and IFRAME

  each time you select an item in the checkbox! the ContentFrame is refreshed! no AJAX call used, just a normal window.open ( Scripts/VehiclePhotos.aspx?VID="+vid+"&PID=1" )