.contentCont
{
    width:500px;
    float:left;
}
.leftCont
{
    width:154px;
    float:left;
}
.rightCont
{
    width:213px;
    float:right;
    /*background-color:#e6eeef;*/
}
.mainRight
{
    width:730px;
    float:right;
}