How to remove an id attribute from a div using jQuery?
Solution 1:
The capitalization is wrong, and you have an extra argument.
Do this instead:
$('img#thumb').removeAttr('id');
For future reference, there aren't any jQuery methods that begin with a capital letter. They all take the same form as this one, starting with a lower case, and the first letter of each joined "word" is upper case.
Solution 2:
I'm not sure what jQuery api you're looking at, but you should only have to specify id.
$('#thumb').removeAttr('id');