JQuery Problem With attr()

Here is a short snippet of HTML (it contains all relevant HTML and javascript code):
Notice this line: alert(id); What I get is a blank popup window. Shouldn't id be equal to 4? I don't understand it. The reason why this matters is because I need the id for the next three/four lines of code that are commented now. EDIT: Now, I'm using valid ids but the alerts are still empty: photos) > 0): ?>

Why? I don't understand.

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