How do I change the Header for IE9? help please

[alicewoman1]

I have a problem with the header in IE9.
In firefox and chrome the header is looking good but in IE9 the menu is going down under the logo.
How do I fix this? I tried allot of things in header.tpl and global.css but nothing works for me.

Can someone help me with this header problem please?

I'm using prestashop 1.4.2.5

global css header part:
/* global layout */
#page {
width: 980px;
margin: 0 auto 2px auto;
text-align: left
}
#header_logo {
float: left;
width: 264px;
display: block
}
img.logo {
float: left;
margin-top: 0.5em;
font-size: 2em;
font-weight: bold
}
#header_right {
float: left;
margin-bottom: 15px;
width: 73%;
text-align: right
}

header.tpl (header part)

<!-- Header -->

{$HOOK_TOP}

[matigemelli]

try to put ccc instead of css and try it in back office performance.