Volume weighted MA

//@version=2
// @title Volume Weighted MA
// @author LazyBear
// List of my public indicators: http://bit.ly/1LQaPK8
// List of my app-store indicators: http://blog.tradingview.com/?p=970
//
study("Volume Weighted MA [LazyBear]", overlay=true)
src=input(close)
lookback=input(10)
ma(s,l) => sma(s,l)

//vma = ma( volume*src, lookback ) / ma(volume, lookback)
nm_=src*volume,  nm=sum(nm_,lookback)
vma=nm/sum(volume,lookback)
plot(vma, color=blue, linewidth=2, title="Volume weighted MA")