Firebug says jQuery variable is null, when it is not

I am trying to set up some jQuery to fill in form fields as quantities of things are chosen on a Drupal page. I am following a tutorial to do this. But when I am just trying to see what variables are holding, like:
var a = $('#edit-submitted-users-desktop-users').val();
where edit-submitted-users-desktop-users is the id of a textbox, I get the value is null in Firebug and the Chrome javascript console. I have no idea what I am doing wrong. I usually only use Firebug for CSS issues.
Here is the page I am working on:
http://www.cloudconnect.net/pricing-estimate
LVL 17
nanharbisonAsked:
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Kim WalkerWeb Programmer/TechnicianCommented:
Where do you have this script? It has to come after the page has loaded.
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David S.Commented:
Where are you putting that JavaScript statement?  In the console or in the page? If in the page, where in the page?
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nullsquidCommented:
for me just typing
$('#edit-submitted-users-desktop-users').val();
(without the 'var a ') into the console returns the value in that field if that is all you want
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nanharbisonAuthor Commented:
The page has been loaded for hours!
I put this in the command line and got null.
I just put what nullsquid suggested, and that worked. I was just doing what the tutorial said to do. I should always go to experts exchange instead of spending hours trying to figure this out. Other than this, the tutorial is very clear:
http://1013.fi/cms/interactive-drupal-web-forms-jquery-javascript-library
Thanks
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