How to use MsgBox with vbscript
Syntax:
    MsgBox(Prompt, Buttons, Title)
Prompt
    The Prompt argument is the message string that appears in the message box.
Buttons
    The optional Buttons argument must only use the constant or value in the MsgBox CONSTANTS.
Title
    The optional Title argument is the title that appears at the top of the message box window.

    Note you may use either the Title argument or the HelpFile, Context arguments. You cannot use both at the same time.
HelpFile
    The optional HelpFile argument is a string that specifies the help file that you wish to display. This must be either a .chm or .hlp file.

    Note you may use either the Title argument or the HelpFile, Context arguments. You cannot use both at the same time.
Context
    The optional Context argument specifies the help context number in the help file of the topic you wish to display. If you have created your own custom help file, then the Context argument is mandatory.

The MsgBox function creates a dialog box with a specified message and prompts the user to click a button, upon which the dialog box closes and a value relating to which button was clicked is returned. These values, along with their Constants, are listed in the table below.

MsgBox Return Values
CONSTANT 	VALUE 	BUTTON
VBOK 	1 	OK
VBCancel 	2 	Cancel
VBAbort 	3 	Abort
VBRetry 	4 	Retry
VBIgnore 	5 	Ignore
VBYes 	6 	Yes
VBNo 	7 	No


MsgBox Button Constants

CONSTANT 	VALUE 	DESCRIPTION
VBOKOnly 	0 	Show OK button
VBOKCancel 	1 	Show OK and cancel buttons
VBAbortRetryIgnore 	2 	Show abort, retry, ignore buttons
VBYesNoCancel 	3 	Show yes, no cancel buttons
VBYesNo 	4 	Show yes, no buttons
VBRetryCancel 	5 	Show retry, cancel buttons
VBCritical 	16 	Show critical message icon
VBQuestion 	32 	Show warning query button
VBExclamation 	48 	Show warning message icon
VBInformation 	64 	Show information message icon
VBDefaultButton1 	0 	First button is default
VBDefaultButton2 	256 	Second button is default
VBDefaultButton3 	512 	Third button is default
VBDefaultButton4 	768 	Fourth button is default
VBApplicationModal 	0 	Demands that the user respond to the dialog before allowing continuation of work in current application
VBSystemModal 	4096 	Causes suspension of all applications until the user responds to the dialog