ActionScript 3.0 :: Dynamic XML Parse Node?

Here is my XML layout:

Actionscript Code:
<xml>   <seriesA> <chart_form> <total_return>75.41%</total_return>  </chart_form>  </seriesA></xml>

I usually do this:

Actionscript Code:
function ParseSeriesData(seriesInput:XML):void {  stats.htmlText = seriesInput.seriesA.chart_form.total_return;}

But I want to do something like this:

Actionscript Code:
var mynode:String = "seriesA";function ParseSeriesData(seriesInput:XML):void {  stats.htmlText = seriesInput.mynode.chart_form.total_return;}