How to pass field value(s) from Page to OTBI (for report or dashboard generation) ?

Summary

An iFrame is created in an existing Page layout in order to accommodate a OTBI report. How to pass field value(s) from Page to OTBI (for report or dashboard generation) ?

Content

An iFrame is created in an existing Page layout in order to accommodate a OTBI report (see attached screenshor).  User will enter  the search criteria in a  Page and I need to generate a OTBI report basing on the value entered.   I would like to know how to pass field value(s)  from  a Page layout to OTBI and execute the report   without asking the user to re-enter the search criteria again. Pls note that this iFrame  is an add-on to a existing Page layout which I don't want to interrupt the existing process.