.col-1, .col-2, .col-3 { float:left}

.main{margin:0 auto; text-align:left; width:780px; }

#header {height:400px;}

#three-column #content .col-1{ width:226px; margin-right:42px}
#three-column #content .col-2{ width:397px; margin-right:42px}
#three-column #content .col-3{ width:226px}
#two-column #content .col-1{ width:226px; margin-right:30px}
#two-column #content .col-2{ width:505px}

#footer { height:123px; }