i've made a few mods to the combobox function and the main script...

see if it works better (it still doesn't work though...)

code:
break on
$ElementArray="machine1","machine2","machine3"
$Window = IECreateWindow("A Simple ComboBox",300,300,640,480)
IEWrite($Window,"Select from the list below...","Courier","5","#0000ff")
$box=IEComboBox("A Simple ComboBox","Your Selection",$ElementArray)  ;pass array
$b1=IEAddButton($box,"Select",220,80,75,30)
$b2=IEAddButton($box,"Cancel",310,80,75,30)
?"pause..." 
get$k  
$window.quit
$window = 0
  exit 1
code:
Function IEComboBox($Title,$text,$ElementArray, optional $cancel)

	$html='<HTML><HEAD><TITLE>$title</TITLE></HEAD><body scroll=no><BR>$text<BR>
	       <OBJECT ID="ComboBox" WIDTH=200 HEIGHT=24  CLASSID="CLSID:8BD21D30-EC42-11CE-9E0D-00AA006002F3">
	       </OBJECT></BODY></HTML> '
	$hsize=250
	$vsize=150

	$Window = IECreateWindow($title,200,200,$hsize,$vsize,$html)
	while $window.busy and $window.readystate <> 4 and @error = 0 loop

	$combobox=$IE.document.GetElementById("combobox")
	for each $element in $ElementArray
		$=$combobox.additem("$Element")
		next
	$combobox.value=$ElementArray[0]
	$IEComboBox=$combobox
	EndFunction
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