Validating alphabetic only string in javascript

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Published on 2010-03-15T21:30:54Z Indexed on 2010/03/15 21:39 UTC
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How can I quickly validate if a string is alphabetic only, e.g

var str = "!";
alert(isLetter(str)); // false

var str = "a";
alert(isLetter(str)); // true

Edit : I would like to add parenthesis i.e () to an exception, so

var str = "(";

or

var str = ")";

should also return true.

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