function chkEmail(email)
on error resume next
dim i,l,pos1,pos2
chkEmail=true
if isnull(email) then chkEmail=false:exit function
pos1= instr(email,"@")
pos2=instrRev(email,".")
if not(pos1>0) or not (pos2>0) or pos1>pos2 then
chkEmail=false
end if
if err.number<>0 then err.clear
end function