Element.setRGBA

This is a simple method that sets RGBA background on elemenets. Method inspired by this article

How to use

The method can receive 2 types of argument sets:

CSS3 rgba values:

#JS
el.setRGBA(123,234,22,0.5);

Hex/alpha pairs:

#JS
el.setRGBA('#aa00cc',0.6);

note - hex value must be a 6 digit hex value