#MainContent {
  margin: 0;
  /*float: left;*/
  width: 610px;
  margin-left: 10px;
  margin-top:10px;
  /*border: 1px solid red;*/
}

#RightContent {
  text-align: center;
  width: 260px;
  float: right;
  Margin-right: 10px;
  margin-left:10px;
  margin-top:10px;
  /*border: 1px solid green;*/
}