div#mainColumn {
    margin-left:260px;
    margin-top:0px;
    width:490px;
}

div#leftColumn{
    float:left;
    width:250px;
    margin-left:-1000px;
    margin-top:100px;
}

div#rightColumn {
    float: left;
    width: 240px;
    margin-left: -240px
}