jquesy css issue

hello i have an issue related to a jquery plugin im using,
plugin is nivoslider
problem is on page load the slider is in the upper top off the page but when u reload the browser (firefox in this case) it is correctly positioned, can u help my positioning issue.
http://www.con-cor.com/sitemap224.htm

note i didnt create the page was just supposed to fix it and this got me stumped.