Message box in asp.net

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VB

ASP.NET

HI..
I need to show a message box in my site.. you people already provide some suggestions still i have prob.. i show my code here;

dim strSUCCESSmessage as string="success"
Page.RegisterStartupScript("OnClick", "<script>alert('" & strSUCCESSmessage & "');</script>") 

i got an error while run this code:

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: BC30648: String constants must end with a double quote.
Source Error:

Line 224:        'mySmtpClient.Send(myMessage)
Line 225:        SmtpMail.Send(myMessage)
Line 226:        Page.RegisterStartupScript("OnClick", "<script>alert('" & strSUCCESSmessage & "');</script>")
Line 227:        ' MsgBox(strSUCCESSmessage, MsgBoxStyle.Information, "Success")
Line 228:      '  dim strErrorDesc as string="Thanks for submitting your request.  We shall revert back to you."

give me the solutions for my prob..

regards
sasikumar