Internet Explorer CSS Issue - css

Question

So I'm attempting to figure out where my cross-compatibility issue is - From what I can tell, Firefox and Safari have been working great, however Internet Explorer (surprise?) has been giving me tons of issues. Take a look at the site below:
https://secure.promptpass.com/index.php?clinic=1
For some reason, the background image is over-extending itself on the top and bottom (if you open the website, you will immediately understand what I mean).
Beyond that, in the Select box next to the "Select a Time" label, to the right there is always a box filled with ":45 pm".
The last remaining issue is that the entire content of this on many versions of Internet Explorer, all of the content is shifted to the left - based on the CSS, everything should be centered
Again, I've poured over this (and I'm sure these are simple things that I have overlooked) however at this point, I'm at a loss as to what this issue would be.
Thanks for any and all help.

Answer 1

First, move this elsewhere:
<!-- Google Website Optimizer Control Script -->
<script>
function utmx_section(){}function utmx(){}
(function(){var k='2883663228',d=document,l=d.location,c=d.cookie;function f(n){
if(c){var i=c.indexOf(n+'=');if(i>-1){var j=c.indexOf(';',i);return c.substring(i+n.
length+1,j<0?c.length:j)}}}var x=f('__utmx'),xx=f('__utmxx'),h=l.hash;
d.write('<sc'+'ript src="'+
'http'+(l.protocol=='https:'?'s://ssl':'://www')+'.google-analytics.com'
+'/siteopt.js?v=1&utmxkey='+k+'&utmx='+(x?x:'')+'&utmxx='+(xx?xx:'')+'&utmxtime='
+new Date().valueOf()+(h?'&utmxhash='+escape(h.substr(1)):'')+
'" type="text/javascript" charset="utf-8"></sc'+'ript>')})();
</script>
<!-- End of Google Website Optimizer Control Script -->
It makes the page render in quirks mode as opposed to standards mode so IE is rendering it in super-retarded mode and in this, margin:0 auto doesn't work in IE quirks. The doctype will make it render in standards mode.