#c1 { margin:x; padding:0px 0px  0px; }
#c2 { margin:; padding:0px 20px 0px 20px; }
#c3 { margin:; padding:20px 20px 20px 20px; height:550px;  }
#c4 { margin:; padding:20px 20px 20px 20px; }