Null error in IE6 with getElementById

[Brian A]

Can anyone tell me what is wrong with :-

tNode=document.getElementById("currentStructure"). firstChild;
alert("tNode="+tNode);

In Firefox the alert reports: tNode=[object Text]
In IE6 the alert reports: tNode=null

If I change the code to

tNode=document.getElementById("currentStructure"). childNodes[0];
alert("tNode="+tNode);

which should be exactly the same, Firefox reports as before
but IE6 reports 'undefined'.

Either way IE6 doesn't like it. So what am I doing wrong??
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[RobG]

Brian A wrote:

Can anyone tell me what is wrong with :-

tNode=document.getElementById("currentStructure"). firstChild;
alert("tNode="+tNode);

In Firefox the alert reports: tNode=[object Text]
In IE6 the alert reports: tNode=null

If I change the code to

tNode=document.getElementById("currentStructure"). childNodes[0];
alert("tNode="+tNode);

which should be exactly the same, Firefox reports as before
but IE6 reports 'undefined'.

Either way IE6 doesn't like it. So what am I doing wrong??

How are we to know what to make of a DOM structure we can't see?
--
Rob