css problem

[Zaphan58]

Ive got a problem with my css, one of my sections keeps jumping to the bottom position instead of the correct one. It looks perfect in firefox but it only does this in internet explorer.

Page can be viewed here: http://www.metalzone.co.uk/development/

The tag in question is <div id="mainContentRight">

And the CSS is below, any help much appreciated.

/**********************************/
/********global navigation*********/
/**********************************/
#globalBanner{
padding: 0px 0px 0px 0px;
width: 100%;
height: 120px;
color:#333333;
background-image:url(../images/banner.gif);
}

#globalNav{
width: 100%;
height: 50px;
background-color:#333333;
padding: 0px 0px 0px 10px;
border-top: 1px solid #FF0000;
border-bottom: 1px solid #FF0000;
}
/**********************************/
/*************links****************/
/**********************************/
a{
	color:#FFFFCC;
	text-decoration: underline;
}

a:hover{
	color:#FFFF99;
	text-decoration: underline;
}
a:visited{
	color: #006699;
	text-decoration: none;
}
/**********************************/
/******main page content left******/
/**********************************/
#mainContentLeft{
float: left;
width: 20%;
height: 700px;
background-color:#000000;
padding: 0px 0px 0px 0px;
}
/**********************************/
/******main page content centre******/
/**********************************/
#mainContentCentre{
float: left;
width: 60%;
height: 700px;
background-color:#000000;
padding: 0px 0px 0px 0px;

}
/**********************************/
/******main page content right******/
/**********************************/
#mainContentRight{
float: right;
width: 20%;
height: 700px;
background-color:#000000;
padding: 0px 0px 0px 0px;
}
/**********************************/
/*************headings*************/
/**********************************/
h1{
font-family: Arial,sans-serif;
font-weight:bold;
font-size:14px;
margin: 10px;
padding: 0px;
color:#FFFFCC;
}
h2{
font-family: Arial,sans-serif;
font-size:10px;
margin: 10px;
padding: 0px;
color:#FFFFCC;
}
h3{
font-family: Arial,sans-serif;
font-size:10px;
text-align: center;
margin: 0px;
color:#FFFFCC;
}
/**********************************/
/************body tags*************/
/**********************************/
body{
	font-family: Arial,sans-serif;
	line-height: 1.166;	
	margin: 0px;
	padding: 0px;
}

#mainContentBottom{
background-color:#000000;
padding: 0px 0px 0px 0px;
width: 100%;
}
p{
font-family: Arial,sans-serif;
font-size:14px;
margin: 10px;
padding: 0px;
color:#FFFFCC;
}
/**********************************/
/************text fields***********/
/**********************************/
.textfield3{
margin-left: 25px;
}
.textfield4{
margin-left: 6px;
}
.textfield5{
margin-left: 28px;
}
/**********************************/
/************profile tables********/
/**********************************/
#table1
{
border-color:#00FF66;
border-width:0px;
border-style:none;
border-spacing:2px;
cell-padding:0;
border:0;
padding:0px;
}