how can i use this code with tree object instead of listbox ???

Code:
Count = ListBox.GetCount("box")
tbSelected = ListBox.GetSelected("box")
ListBox.SelectItem("box", sel)
data = ListBox.GetItemText("box",sel);
RL = data
RL = "www".."."..RL..".".."com";
Web.LoadURL("web1", RL)
sel = sel+1
if sel == Count then
sel = 1
else
sel = sel
end