Hi !!
It would be great if the checkboxes can stay checked if the admin is looking at the profile of another users...
let me explain...
I checked 2 checkboxes that i will delete... Right before delete them, i look at the profile of one of them. Okay, this user must be deleted.. so i come back to the previous page... BUT ... the 2 checkboxes are now UNCHECKED...
U know what i mean ?

They must stay checked ... unless the admin unchecked them, delete them or click on a new button called "Uncheck All" ...
And.... why not try to display the infos about the user on another frame instead of a new page ?