Question about silver coins

Hello, I'm new to this site and collecting coins. I know little to nothing about coins so I was hoping someone could help me out. I have a running auction on eBay for a little over 400 coins (All are in pure silver). I was wondering if anyone could give me a rough estimate of what they are worth. I provided all the information needed in the auction. I haven't had it appraised and don't really plan to but if someone can give me a rough figure of the value I would certainly appreciate it very much.
Thanks in advance!
~Mark
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=160169460388&ssPageName=STRK:MESE:IT&ih=006
Thanks in advance!
~Mark
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=160169460388&ssPageName=STRK:MESE:IT&ih=006
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Comments
1964 JFKs are 90% silver, while 1965-1970 are only 40%, so you need to specify how many of each type.