Pagination

	A	B	C	D	E	F	G	H	I	J	K	L	M	N
1	active	left		buttons					right		reckoned		calculated
2	active	left		5					right		first	last	first	last

3	1	⇤	←	1	2	3	4	5	→	⇥	1	6	1	5
4	2	⇤	←	1	2	3	4	5	→	⇥	1	6	1	5
5	3	⇤	←	1	2	3	4	5	→	⇥	1	6	1	5
6	4	⇤	←	2	3	4	5	6	→	⇥	2	7	2	6
7	5	⇤	←	3	4	5	6	7	→	⇥	3	8	3	7
8	6	⇤	←	4	5	6	7	8	→	⇥	4	9	4	8
9	7	⇤	←	5	6	7	8	9	→	⇥	5	10	5	9
10	8	⇤	←	6	7	8	9	10	→	⇥	6	11	6	10
11	9	⇤	←	7	8	9	10	11	→	⇥	7	11	7	11
12	10	⇤	←	8	9	10	11	12	→	⇥	8	12	8	12
13	11	⇤	←	8	9	10	11	12	→	⇥	8	12	8	12
14	12	⇤	←	8	9	10	11	12	→	⇥	8	12	8	12
15	first (javascript)	(active <= Math.ceil(buttons / 2)) ? 1 : (active + Math.floor(buttons / 2) > total) ? (total - buttons) + 1 : active - Math.floor(buttons / 2)
16	last (javascript)	first + (buttons - 1)
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