your doctype tag is incomplete:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
Ie requires a link to the DTD file, or it will use Quirks mode when rendering CSS, in quirks mode IE uses the 5.5 rendering engine.
change the doctype tag to:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">