I wanted to input here just a slight note.  Mike, except for a couple of 
minor voices, most dispensationalists believe that it is impossible to 
be saved during the Tribulation.  in fact, most have strongly criticized 
LeHaye and Jenkins for this thought he is advancing.  Now, I am no 
longer a Dispensationalist, but I was personally present with Charles 
Ryrie addressed this issue.  He believes that the Rapture will occur and 
a short time will remain for the Spirit to save some after the Rapture, 
but after that, you cannot be saved. From my reading on 
Dispensationalism, this is the predominant thought. 

I am not a dispensationalist so my comments may be worthless, but I have 
studied Dispensationalism extensively. 

Derick