[Chenardizzle]

I'm trying to get a monthly balance calculator to work, but I'm completely lost.
I have the html code and cascading style sheet all working together, but my javascripting is where I completely fall apart.
This is what I have so far:

var $ = function(id) { return document.getElementById(id); }
	//--Variables--//
var deposits = 0;
var withdrawls = 0;
var runningBalance = 2000;

var add_trans = function () {
	
	var amount = parseInt( $("amount").value );

		$("deposits").value = ""
		if ( isNaN(amount) || amount <= 0 || amount == null ) {
			alert ("You must input more than $0.01 to make a deposit.");
		} else if ( amount >= 0 ) {
			deposits++;
			runningBalance += amount;
		}
			
		window.onload = function(){
	$("add_trans").onclick = add_trans;
	}
}

I know from listening to people talk about it that I need to have an array of arrays and a bunch of functions, but as I'm completely new to this most of what they say goes well over my head. Can anyone help me make sense of this, please?

[Dormilich]

first of all, lines #19 - #21 belong outside the function body.

and yes, it might not be a bad idea to store the balance (and related data into an object.