Mozilla vs Explorer

HI,

My blog (laoujetemmenerai.free.fr)is exposed as designed using Mozilla Firefox but not using internet explorer. Please try both and you will see that only 1 or 2 posts can be seen with internet explorer and le sidebar is missing. But when we use Mozilla, it is just as normal. Please where come from the probleme, and how can I solve it.
TThanks for your answer.