Thanks first!
//the loaded jpg to be material
var bt:BitmapTexture=new BitmapTexture(Bitmap(LoaderInfo(e.target).content).bitmapData)
var tm:TextureMaterial=new TextureMaterial(bt)
tm.bothSides=true
//tm.alphaBlending=true
//tm.alphaPremultiplied=true
//tm.alphaThreshold=0.2
tm.alpha=0.99999
Get this look,please see the attach: