.sidebar_left  {
display:block;
float:left;
margin:0 0 0 15px;
}

#leftcolumn {
width:520px;
float:left;
}

#rightcolumn {
float: right;
width: 220px;
}

#commentform .comment_input {
width: 180px;
}
.commentlist .body {
width:410px;
}
.commentlist li .top {
width:405px;
}