Hi,
I tried to use MessageBox.Show() function, but I didn't find it.
I use this function in WinForms.
Sorry,I'm new user in ASP, so maybe my questions will be premitive.
Regards...

Remember that VBScript is usually used SERVER SIDE and JavaScript is usually used CLIENT SIDE.

Perhaps try something like this "Yet to be developed" JavaScript alert box:
Response.Write "<script type='text/javascript'>alert('Yet to be developed.');</script>"

Or using a variable:
MyVariable = "Yet to be developed."
Response.Write "<script type='text/javascript'>alert('" & MyVariable & "');</script>"

Or with multiple lines:
Response.Write "<script type='text/javascript'>alert('Coming soon.\nYet to be developed.');</script>"