ERROR in FF.au3

Func _FFCmd($sArg, $iTimeOut = 30000, $bTry = True)
	Local Const $sFuncName = "_FFCmd"


	If StringLeft($sArg, 1) = "." Then $sArg = "window.content.document" & $sArg


	If $bTry And Not StringInStr(StringLower($sArg), "try") Then $sArg = "try{" & $sArg & "}catch(e){'_FFCmd_Err';};"


	Local $sArgWrapped = StringReplace($sArg, "window.content.document", "window.content.wrappedJSObject.document")


	$sArg = StringReplace($sArg, "window.content.document", "window.content." & $_FF_FRAME & ".document")
	$sArgWrapped = StringReplace($sArgWrapped, "window.content.wrappedJSObject.document", "window.content.wrappedJSObject." & $_FF_FRAME & ".document")


	If (Not StringInStr($sArg, ".frames[")) Or StringInStr($sArg, "evaluate") Or (Not StringRegExp($sArg, "\.[a-zA-z]+\(.*?\)(\[.+\])?\.", 0)) Then
		If __FFSend($sArg) Then


			$sRet = __FFRecv($iTimeOut)


			;If Not @error Or String($sRet) <> "_FFCmd_Err" Then
			If Not @error And String($sRet) <> "_FFCmd_Err" Then
				Return $sRet
			ElseIf StringInStr($sArgWrapped, "wrappedJSObject") Then
				__FFSend($sArgWrapped)
				$sRet = __FFRecv($iTimeOut)
				If Not @error And String($sRet) <> "_FFCmd_Err" Then Return $sRet
			EndIf
		EndIf
	Else
		__FFSend($sArgWrapped)
		$sRet = __FFRecv($iTimeOut)
		If Not @error And String($sRet) <> "_FFCmd_Err" Then Return $sRet
	EndIf


	  SetError(__FFError($sFuncName, $_FF_ERROR_RetValue, $sRet))
	Return ""
EndFunc