Pivots Support Resistance Zone

This simple script base on function of Pivot High Low to plot Support and Resistance Zone on chart with detail as below:
1. Support Zone
+ New Pivot Low is plotted
+ New Pivot Low lower previous Pivot Low
+ Upper Line of Support Zone is previous Pivot Low
+ Lower Line of Support Zone is new Pivot Low
2. Resistance Zone
+ New Pivot High is plotted
+ New Pivot High higher previous Pivot High
+ Upper Line of Resistance Zone is new Pivot High
+ Lower Line of Resistance Zone is previous Pivot High