[Plugin: Terms of Use] cookie lifetime problem

Hi,

I want to use this plugin on frontpage (page called ‘agreement’) of my WP
But i have to ask for agreement form, every time that user open it.

So i simulated it changing settings of cookie_lifetime to 30 seconds, and it seems that works perfectly on firefox 9.0.1, but it doesn’t work on internet explorer 9.0.8 and chrome.

Is there any option on this plugin to ask for agreement form, every time that user open or refresh it?
or what can i do to solve this problem?

http://wordpress.org/extend/plugins/terms-of-use-2/