now is happening with opera too

is not happening with safari or IE

an it never happen in this page http://nomo.cl/index.php?main_page=i...alerv9sum6heb6

but in http://nomo.cl/index.php?main_page=index&cPath=1_6 from page one to 6 it happend all the time in FF and Opera


any Ideas?

I have read a lot of post with this same problem but not seeing any fix to it, or a fix reported back