Naming an Array

I have 4 arrays. Their names are news1Ar, news2Ar, news3Ar, news4Ar.

When I push a ‘next’ button I want the next array to load its text.

news_mc.newsNext_mc.onRelease = function() {
    this._parent.news_txt.htmlText = "<.news_txt_h1>"+ **'news'+newsShowing+'Ar'**.title "</.news_txt_h1>"+ newline + "<.news_txt>"+ news2Ar +"</.news_txt>";

The bold part I’m having trouble with. I need to dynamically name the array to the next array name. Like news1Ar to news2Ar.

Thanks for any suggestions you might have.