URL image's addresses:
1st:
⇦ = '0' value
2nd:
⇦ + ⇧ = '1' value
3rd:
⇦ + ⇧ = '2' value
4th:
⇦ + ⇧ = '3' value
5th:
⇦ + ⇧ = '4' value
6th:
⇦ + ⇧ = '5' value
7th:
⇦ + ⇧ = '6' value
8th:
⇦ + ⇧ = '7' value
Number of active image's sources (minus one):