strReturnURL problem !!!!

I have a problem with "login_user_test.asp" Page ...

just take a look at this code in "login_user_test.asp" Page :

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'Get the forum page to return to
If blnLoggedInOK = False Then

strReturnURL = "login_user.asp?" & Request.QueryString

'Redirect the user back to the forum they have just come from
ElseIf Instr(Request.QueryString, "login_user.asp") Then

strReturnURL = "Travel.asp" & Replace(Request.QueryString, "login_user.asp", "", 1, -1, 1)

'If comming from insufficient_permission.asp page redirect back to forum index
ElseIf Instr(Request.QueryString, "insufficient_permission.asp") Then
strReturnURL = "Forum.asp" & strQsSID1

'Return to forum homepage
Else
strReturnURL = Request.QueryString
End If

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I change the strReturnURL to "Travel.asp"

but after login to site, the users redirect to "http://localhost/%3cravel.asp?"

why the "Travel.asp" convert to "%3cravel.asp"   ?????

any one can help PLZ ???