switchtheme and the back button

this module doesn't seem to be able to handle back button issues. when you switch the theme, then go ahead in your page and switch back, the theme won't be changed again. in fact pressing the browser's back button should cause effects on the theme, though.

i'm working on a barrier-free website and want to use this module to let the users switch bewteen the normal view and a high-contrast view of the site (moreover with a very simple visual structure, i guess i am forced to use two themes).

how could i go on?