Random circles in SVG and JavaScript (H Verrill)

This is a modified version of purple circles animation.
This is a bit buggy; If you want to switch from animate to rain, maybe best reload page, or they try and run at the same time.
Also, I didn't bother to reset the buttons values after various things are clicked, which basically means you have to click on some buttons twice sometimes. Sometime I'll probably get round to going through the code...

opacity = 5
rainspeed = 5
number of circles=
Max radii = Min radii = Max X = Min X = Max Y = Min Y =
screensize =

circles
circles
circles
circles
circles
circles