“Back to search results” problem

[nightlon]

I have a form with many inputs, but not all inputs must be filled in.Form action is set to a php file, which checks which inputs are set and builds a query to query MySQL.Then I display the results on the main page, and the users may click on an ad to show.When clicked an ad, a new page opens with several options for the user (change ad, delete ad, save ad etc).On this page, I am currently struggling with a 'back to search results' button/link. I don't know how to do this. I thought firstly about the 'history.go' to just make a 'back' button, but if the users would use one of the options on the page then the 'back' wouldn't work!Another way would be to somehow save the query in a hidden input and pass it to the 'show ad' page or something... But this seems unsafe as the query is visible to users!Do you have any ideas or suggestions?Thanks