#LeftContent {
  width: 0px;
  float: left;
}
#RightContent
{
float:left;
width: 180px;
margin-top: 30px;
margin-left:10px;
}

#MainContent{
float:right;
  margin-right: 10px;
  margin-top: 10px;
  width: 700px;
}