logo size & static front page

Hi there, I'd like to set a static homepage but when I do the header image/logo causes the site to blink and flash when scrolling down. I think it has something to do with the way the header changes size when scrolling down. it doesn't do this when the static front page is set but does when recent posts are selected. i was playing around with the css and used some code i found in these forums to make the header not adjust size--and now i can't seem to see where any changes were made and the change only appears when the static page is selected. I don't mind the header and log changing size when scrolling down the site, though i'd prefer it not do this, but i really want to use a state page and not recent posts here's the site: http://www.hobarthandbooks.com/ currently set to a static page. Thanks!