Use expression selector to animate text out After Effects

Hi,

I'm pretty much a novice at using expressions in After Effects but I have this expression for animating the text on screen with a little bounce effect by using the animate position and adding an expression selector.

delay = .1; myDelay = delay*textIndex; t = (time - inPoint) - myDelay; if (t >= 0){ freq =2; amplitude = 100; decay = 8.0; s = amplitude*Math.cos(freq*t*2*Math.PI)/Math.exp(decay*t); [s,s] }else{ value }

Is it possibe to adjust the above code so that the same effect can be used to animate the text out at the end of the layer instead of in at the beginning?

Any help would be massively appreciated, I've been searching for an answer for 2 days.

If you need any more info from me just let me know.

Thanks all.