for (PosNr = 0; PosNr <= DevArray.length; PosNr++) {
^ wirklich?
document.DevListForm.DevListSelect+IPRange
document.DevListForm.elements["DevListSelect"+IPRange]
for (PosNr = 0; PosNr <= DevArray.length; PosNr++) {
^ wirklich?
document.DevListForm.DevListSelect+IPRange
document.DevListForm.elements["DevListSelect"+IPRange]