.span12 {
width:940px
}
.span11 {
width:860px
}
.span10 {
width:780px
}
.span9 {
width:700px
}
.span8 {
width:620px
}
.span7 {
width:540px
}
.span6 {
width:460px
}
.span5 {
width:380px
}
.span4 {
width:300px
}
.span3 {
width:220px
}
.span2 {
width:140px
}
.span1 {
width:60px
}