Simple Question in XML

[jeba]

Hi there!
In XML file, how do I check if a particular element exists or not in ASP (Vbscript)?
I have used this:

	set elmt=objXML.selectSingleNode(elmntname)	'elmntname is passed as a parameter

I have checked for IsNull(elmt), which always returns True, even if there is a node.

Also I have used the following code to check,

	if elmt is nothing then
		Response.write "Node not found!"
	else
		Response.write "Node found!"
	end if

But, this gives the "Node not found!" message, even if there is one in the file.
Please help me.