Check for document ID?

[michael]

Is there a way for Javascript to check if a document CSS id exist anywhere
on a page, for example, if "bla" exists?

<a href="asf" id="bla">

[CryingClinton]

var obj=document.getElementById('bla');
if (typeof(obj)=='undefined' ) alert('The object does not exist!'); // or
typeof(obj)!='object'

"michael" <no****@example.com> ????
news:cb*************@news.t-online.com...

Is there a way for Javascript to check if a document CSS id exist anywhere
on a page, for example, if "bla" exists?

<a href="asf" id="bla">

[Richard Cornford]

CryingClinton wrote:

var obj=document.getElementById('bla');
if (typeof(obj)=='undefined' ) alert('The object does not exist!');
// or typeof(obj)!='object'
The W3C Core DOM - getElementById - method is specified as returning -
null - when it cannot locate an element with a corresponding ID
attribute in the DOM. The - typeof - operator returns the string
"object" when its operand is - null - so neither of these tests will
work. A type-converting test would be more effective in this situation.
"michael" <no****@example.com> ????

Please do not top-post in comp.lang.javascirpt.

Richard.