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start by "beautifying" the code to make it easier to read and work with (a search for javascript beautifier will yield some results).
Then it's just a matter of walking through it line by line. The little snippet of code you've posted may look like this when beautified:
function aroy(xlbh) {
var zv43, e347 = "", ags5, q4we, jx7x = ""
So you can see a function, which takes a single parameter (xlbh), which has several variables defined in the function. You just need to beautify the whole thing, then put some alert statements inside to see what the values of some of it's properties are.