Glow Filter Loop (Canadian Tutorial)

Based on this very good tutorial by Canadian http://www.kirupa.com/developer/flash8/filter_effects2.htm

I would like to have the filter onEnterframe and when it goes for ex. up blurX equal to 20 it would go gf.blurX–; until it reaches 0 , and then loop up to 20 and so on.
Can anyone help?

I have used this code so far dont know how to continue:


import flash.filters.GlowFilter; 
var gf:GlowFilter = new GlowFilter(0x356D83, 100, 3, 3, 5, 3, false, false); 
kText.filters = [gf]; 
kText.onEnterFrame = function() { 
if (gf.blurX < 10) { 
gf.blurX++; 
gf.blurY++; 
} 
if (gf.blurY >3) function(){ 
gf.blurX--; 
gf.blurY--; 
} 
kText.filters = [gf]; 
 
};