.one_of_one{ position:relative; float:left; width:960px; margin:0 0 40px 0;}
.one_of_two, .two_of_four{width:456px;}
.one_of_three{width:288px;}
.two_of_three{width:623px;}
.one_of_four{width:204px;}
.three_of_four{width:707px;}
.one_of_two, .two_of_four, .one_of_three, .two_of_three, .one_of_four, .three_of_four{ margin:0 48px 40px 0; position:relative; float:left;}
.last{ margin-right:0;}
.clearfix{ clear:both;}