Some actionscript help

[KingRanter]

I have 2 input boxes. Each will contain a string, and when a button is pressed, a shitload of stuff happens to a lot of other text boxes, most of which is walking through strings and whatnot. I am only stumped by one. >_>

The 2 strings have to alternate letters, starting with input 1 and then input 2 and back and forth, the longer one of course haing the rest of its letters at the end. for example

Input 1
King

Input2
Ranter

Output
KRianngter

yes i realize that "Ria" is in the output, thats a coincidence, but its funny. anyways, I've not the slightest clue where to get started. I need a for loop, but i've got nothing else. I use Actionscript 1.0 if that helps, cause the school only has Flash MX.