[jQuery] Problem with the fieldselector [@name=xyz]

[Creazion]

Hi, I need help with the following code.

This one alerts 'undefined':

var field = 'test';
alert(jQuery("[EMAIL PROTECTED]'" + field + "']").attr('id'));


and this one gives me the correct id:

alert(jQuery("[EMAIL PROTECTED]'test']").attr('id'));


So why the first one doesn't work?

Thanks for your help.