thanks paul.
well let me expalin problem a bit more detail.
Page A has one Text field T1 and one link which is opening a new window thr
java script.
on Page B(new popup) there is a list of city names. when i click any name on page B a javascipt function passCity('NYC') is called and pass NYC to textfield-T1 on page A and pageB closed. so how to trace route of NYC from page B->pageA in context of JMeter???