Hi: In this statement what is the '{0}'? " var elem = document.getElementById('{0}_SelectedNode');" I know the single parameter inside the GetElementById is the Id Tagg value of the control to look up but the tag he looks up has an id of something like Panel1_SelectedNode that it looks like he may be replacing with the {0} in the GetElementById Statement. haven't found anything, actually too much, on the statement but nothing using '{0}'. What is it called, index or something and what does it mean? I'll dig around more if I can find something to google on that points to this particular syntax. My guess is it has to do with a Document Control relative Reference or something but I just can't find anything like it googling so far. Thanks:Rick Farmington Mich. USA