appending to a string.

How do I append the i to this string? I keep getting alert is null. But if I do this it works. Thanks.
var el = $("element0").firstChild.nodeValue;

This is not working:
var i = 0;
var el = $('"element' + i + '"').firstChild.nodeValue;
alert(el);
kadinAsked:
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käµfm³d 👽Commented:
var el = $('element' + i.toString()).firstChild.nodeValue;

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kadinAuthor Commented:
Thank you very much.
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