Microsoft VBScript compilation error '800a0401'

Expected end of statement

D:\WEBSITES\GREETINGS\WEBCHAT\../SecurityCheck.asp, line 4

if instr(1,request.servervariables("HTTP_USER_AGENT"),"Firefox") then response.redirect "http://www.LansUnlimited.com" or instr(1,request.servervariables("HTTP_USER_AGENT"),"MSIE+6.0;+Windows+NT+5.1;+SV1;+.NET+CLR+1.1.4322") then
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