Div MENU spacing incorrect in Firefox and Perfect in IE7

When i display this website in IE7 it works perfect and when i display it in FIREFOX the menu is spaced down 20-25px.

CSS STYLESHEET CODE FOR MENU AND HEADER

body,html {
margin: 0 0 0 0;
padding: 0 0 0 0;
height: 100%;
width: 100%;
background-color: #ffffff;
background-image: url(images/main.gif);
background-repeat: repeat-x;
font-family: Arial, Verdana, Helvetica, sans-serif;
font-size: 12px;
color: #000000;
}

#page {
width: 750px;
margin-top: 0px;
margin-left: auto;
margin-right: auto;
margin-bottom: 0px;
}

#page-header {
width: 670px;
height: 85px;
padding: 20px 40px 0px 40px;
background-image: url(images/header.gif);
line-height: 85px;
font-size:28px;
}
#page-header2 {
width: 660px;
height: 175px;
padding: 0px 40px 0px 40px;
background-image: url(images/header2.gif);

}

#menu {

height:20px;
position:relative;
z-index:100;
font-family:arial, sans-serif;}

* html .menu {width:670px; width:670px;}
.menu ul {padding: 0px 0px 0px 0px; margin:0px; list-style-type:none; float:left;}
.menu ul ul {width:109px;}
.menu li {float:left;width:109px;position:relative;}
.menu a, .menu a:visited {
display:block;
font-size:11px;
text-decoration: none;
color:#fff;
width:100px;
height:20px;
border:1px solid #fff;
border-width:1px 0 1px 1px;
background:#000;
padding-left:24px; line-height:20px; font-weight:bold;}

* html .menu a, * html .menu a:visited {width:149px; width:138px;}
* html .menu ul ul {top:30px;top:31px;}
* html .menu ul ul a, * html .menu ul ul a:visited {width:150px;width:128px;}

/*Drop Class */
.menu ul ul a.drop, .menu ul ul a.drop:visited {background:#d4d8bd 130px center;}
.menu ul ul a.drop:hover{background:#c9ba65;}
.menu ul ul :hover > a.drop {background:red 130px center;}
.menu ul ul {visibility:hidden;position:absolute;height:0;top:20px;left:0; width:149px;border-top:1px solid #000;}

.menu table {position:absolute; top:0; left:0; border-collapse:collapse;}

.menu a:hover, .menu ul ul a:hover{color:#000; background:red;}
.menu .menu ul ul :hover > a {color:#000; background:red;}

.menu ul ul a, .menu ul ul a:visited {color:#000; height:auto; line-height:1em; padding:5px 10px; width:128px;border-width:0 1px 1px 1px;}

.menu ul ul ul{left:149px; top:-1px; width:149px;}

.menu ul li:hover ul,
.menu ul a:hover ul{visibility:visible; }
.menu ul :hover ul ul{visibility:hidden;}
.menu ul :hover ul :hover ul{ visibility:visible;}
}

CODE FOR BODY OF DOCUMENT

• Home
• About Us
  • Mission Statement
  • Company Profile
  • What We Do

• Plumbing
• Contractors
• Projects
  • Churches
  • Country Clubs
  • Family Housing
  • Military Housing
  • Learning Institutions

• Links
• Ferguson
• HD Supply
• Grohe
• Moen
• Kohler

• Pipe Lining
  • What we do
  • Projects

• A/C Heating

• Projects