set times when logged into iframes
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Usine VB.Net on VS2010: I use iFrames rather than masterpages so I don'r reload everything all the time.   I have 4 iframes running all the time.   Some pages in the iFrames have access allowed by logging in, but not all.   I have a website where people can log into their account.   I currently use Session State to allow access for a period.   Trouble is: after a while this time is completed and the login page appears in the wrong frame.   I would like to have it go back to the default page but VB does not allow you to use Target in the statement.   This is the line I put on every page where timeout can occur.   My website is on www.sunny-canary.com and I only have 2 apartments I look after.   
{If Len(Session("Guest")) = 0 Then Response.Redirect("Default.aspx")}
Any ideas would be greatfully received.   Thank you in advance