My page displays fine in IE8 but not in FF 5.0.1. (not allowed to upgrade the version of FF).

Everything is pushed to the left. I have tried the various fixes
/*this is to keep page from shifting to left on load in safari and firefox*/
html { min-height: 100%; margin-bottom: 1px; }
html { overflow: -moz-scrollbars-vertical !important; }

or

\#mainWrapper {
float: left;
}

I cant provide a link as this is an internal website.

Cant get it to work.