Very basic JavaScript question

Sorry for actually asking this as it’s a ridiculously simple problem, but I’m brand new to JavaScript.
I know how to do what I want to in ActionScript, but I’m not sure what the syntax is to accomplish it in JavaScript.
In ActionScript I’ve written a chunk of code that looks something like this:

[I]var currentNumber = 1;
var picture1Video = ” firstVideo.jpg”;
var picture2Video = ” secondVideo.jpg”;

placeHolder1.loadMovie(this[“picture”+(currentNumber)+”video”])

currentNumber++;

placeHolder2.loadMovie(this[“picture”+(currentNumber)+”video”])[/I]

So basically I’m incrimenting currentNumber to change what variable placeHolder1 and placeHolder2 are looking at.

How do I write that in Javascript, so that a variable name being called is made up of a string and the contents of another variable, like [“picture”+currentNumber+”video”] ?

Cheers for any help!

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