Fine in FF, Opera, but not in IE

/* CSS Document */
body,
html {
    margin:0;
    padding:0;
    background:#ffcc99;    
    font-family:Arial, Helvetica, sans-serif;
    font-size:.9em;
    }
body {
    min-width:750px;
    }
#wrap {
    background:#fff;
    margin:0 auto;
    width:750px;
    }
#header h1 {    
    margin:0;
    padding:15px 0 20px 0;
    background:#fff;    
    }
#main h2, #main h3, #main hr {
    padding:0px 25px;
    background:#fff;
    float:left;
    width:500px;
    color:#000000;
    }
#main p, #main h4, #main ul {
    padding:0 25px;
    background:#fff;
    float:left;
    width:500px;
    color:#000000;
    }
#main td {
    border-width:0px;
    border-style:solid;
    border-color:#000000;
    }
#footer  p {
    padding:5px;
    margin:0;
    background:#0000cc;
    clear:both;
    }
#sidebar h3, #sidebar p {
    padding:10px 10px 0 0;
    background:#fff;
    }
a:link {
    color:#003399;
    text-decoration:none;
    }
a:visited {
    color:#ff9933;
    text-decoration:none;
    }
a:active {
    color:red;
    text-decoration:none;
    }
a:hover {
    color:#1E90FF; 
    text-decoration:underline;    
    }
a img {
    border:none; 
    }
table {
    float:left;
    padding:10px 0 20px 120px;
    }
#nav {
    background:#0000cc;
    padding:5px;
    color:fff;
    }
#sidebar ul {
    margin-bottom:0;
    }

#main{
float:left;
width:500px;
padding:0;
margin:0;
}
#sidebar{
float:right;
width:250px;
padding:0;
margin:0;
}

#sidebar img{
vertical-align: middle;
}