the issue is onlu occuring in IE, not in fire fox or safari.
the problem is that there are comments in the code before the doctype tag:
<!-- saved from url=(0014)about:internet --><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!-- saved from url=(0014)about:internet -->
this is causing IE to render the page in quirks mode using the IE 5.5 rendering engine.
remove those comments that are around the doctype tag:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">