#leftcolumn {
display: inline; 
 color: #333;
 margin: 10px;
 padding: 0px;
 width: 458px;
 float: left;
  min-height: 400px;
  height: auto !important;
  height: 400px;
}
#rightcolumn { 
 float: right;
 color: #333;
 margin: 10px;
 padding: 0px;
 width: 458px;
 display: inline;
  position: relative;
 min-height: 400px;
  height: auto !important;
  height: 400px;
}