You can fix the header problem by setting the height of logoWrapper in the stylesheet to at least the height of your header image (127px).

I can't tell exactly what's causing the right column to be pushed out, but I'd look at the code for the slideshow first. You should remove the extra <html> and <body> tags, and this doesn't look right:



.centerdiv>div{ /*Proper way to center a relative div*/
width: 400px;
margin-left: 10px;
}