Move your wrapper tag up to underneath the body tag.
If you move it here, it will stick to the upper left:
<body>
<div id="wrapper">
<div id="page">
<div id="header">
Have you tried http://ww.wp.xz.cn/extend/plugins/simplemodal-contact-form-smcf/ or were you trying to have the map display in the modal box as well?
