how to trigger javascript from active x control

Dear all,

1. I've made an activeX control that is embedded in IE, however I want to
trigger an javascript or vbscript function when the user leave my control
( my control has GUI ), how could this be done?
I've tried the code intuitively like

Public Event onFieldLeave(strField As String, strTable As String)

Private Sub UserControl_LostFocus()
RaiseEvent onFieldLeave("attachment", "attachment")
End Sub

and use javacript like

<SCRIPT language="JavaScript" FOR="ReadDirCtl" EVENT="OnFieldLeave(
strField, strTable )">
alert ("OnFieldLeave is fired");
</script>

however, nothing appeared.

2. Everytime I open the active X control that have script to control it, it
always ask "may not safe for scripting", could I register the control as
safe for scripting so i don't need to answer this question each time when I
open the browser, in face the active X control is registered and it is an
OCX from local computer.

Thank you for any advice!

Regards,

Ginrai