gistfile1.txt

@mixin boxit ($dir) {
	display:box;
	display:-moz-box;
	display:-webkit-box;
	box-orient:$dir;
	-moz-box-orient:$dir;
	-webkit-box-orient:$dir;
}

@mixin order ($num) {
	box-ordinal-group: 1;
	-moz-box-ordinal-group: 1;
	-webkit-box-ordinal-group: 1;
	box-ordinal-group: #{$num};
	-moz-box-ordinal-group: #{$num};
	-webkit-box-ordinal-group: #{$num};
}

add this to the containing block:

@include boxit(vertical);

and this to each item you want to reorder (changing the number to the order you want it to appear in - here we are swapping headings as an example):

h1 { @include boxnum(2);}
h2 { @include boxnum(1);}