sidebar disappears and text get bigger

sometimes the text on the posts get bigger and the sidebar disapears

do you have a more detailed description of ‘somtimes’ ?

i.e. a link to a post where this happens?

if you visit my blog it probably will happen i can’t determine how many times, but it seems random. I have inserted a ad script but till yestarday it never happened. ??

thanks for your help

by the way do you see a slide ad on the bottom? thats the script i was talking. thanks

P.s.- I notice in the header that the title font is smaller and the “subtitle” goes from the right side to the left right beneath the title and it seems that it doesn’t happen in firefox only on ie