body {min-width:640px}

#header,#menu,#content,#sub-section,#footer {
overflow:hidden;
display:inline-block
}

/* safari and opera need this */

#header,#footer {width:100%}
#menu,#content,#sub-section {float:left}
#menu {width:20%}
#content {width:60%}
#sub-section {width:19.9%}
#footer {clear:left}