#main {width:880px; text-align:center; margin: 0 auto;}

.col_1, .col_2, .col_3, .col_box_1, .col_box_2{ float:left;}

#content, #footer {width:880px}
#header {width:740px}

#content .col_1{width:242px;}
#content .col_2{width:440px;}