InfoPath Dev

I feel this is REALLY a newbie question:

How do I set an element or attribute to a variable in jscript? The code below is what I tried. The first line sets a variable to a function. I then use this function in an alert to verify it's presence. The last line is the issue. The syntax doesn't seem to work. I did several searches before posting but I couldn't not find anything.

 var GUIDLabel = GUIDGen();

XDocument.UI.Alert (GUIDLabel);

XDocument.DOM.selectSingleNode("my:Main/my:Subgroup/my:Microgroup/my:GUIDForm").Text = GUIDLabel;

I believe I found the answer. Needed to set the value as a string.

 XDocument.DOM.selectSingleNode("my:Main/my:Subgroup/my:Microgroup/my:GUIDForm").Text = String(GUIDLabel);