Stuck trying to animate mc's - see code

[Leftyplayer]

Ok, I corrected this:

shape.velX = (Math.random()*20)-10
shape.velY = (Math.random()*20)-10

instead of "10" I had a smaller number there before, which resulted in a bias in the random numbers created, thus shapes going mostly in one direciton.

Still having trouble with this ... my understanding of Math.random is clearly not good ... off to google:

if(shape.y >= stage.stageHeight-shape.length/2){
shape.velY = shape.velY*Math.random()*20+5;}

if(shape.y <= stage.stageHeight-shape.length/2){
shape.velY = shape.velY*Math.random()*20+5;}

if(shape.x >= stage.stageWidth-shape.width/2){
shape.velX -= shape.velX*Math.random()*20+5;;}

if(shape.x <= stage.stageWidth-shape.width/2){
shape.velX -= shape.velX*Math.random()*20+5;;}

yes, I'm at Actionscript for dummies level : ) ... gotta start somewhere. Thanks for any help.