Displaying an image in an "if" statement

Hi all, i want to display an image "if" a certain  value is true, and am having trouble doing this. Here is the code:
Dim tReq As RealexPayments.RealAuth.TransactionRequest Dim ccReq As RealexPayments.RealAuth.CreditCard Dim tResp As RealexPayments.RealAuth.TransactionResponse Dim backgroundColour As String Dim displayMessage As String Try Dim orderID As String orderID = Now().ToString("yyyyMMddhhmmss") tReq = New RealexPayments.RealAuth.TransactionRequest("realexsample", "secret", "secret", "secret") ccReq = New RealexPayments.RealAuth.CreditCard(Session("cardtype"), Session("cardno."), Session("expirydate"), Session("cardholdername"), Session("cvv"), RealexPayments.RealAuth ...