enars,
I took a quick look at your site in FireFox, IE 7 and Opera. The overall visual impression is decent and also consistent between the browsers. You might want to run the site thru the WC3 HTML validation (
[Invalid] Markup Validation of http://www.hotelbooklet.com/ - W3C Markup Validator) and see if you can fix any issues found there (20 when I checked). Internet Explorer doesn't like your javascript for some reason so you may want to check into that. Also instead of having the "find cheap hotels" section hidden I would leave that open so that users will not have to click on it to see it. Many may not realize that clicking it doesn't go to an ad or another site.