if Object Not Found?

[TYL3R B™]

Say i'm using Accessible objects. and the object wasn't found...
anyway of using if or something?
like...
Acc a=acc("Click here to create an account" "TEXT" "YahooLogin" "id=0" "" 0x1801 0x40 0x20000040)
a.DoDefaultAction
if..ObjectNotFound..
clo "Yahoo"

Thanks Guys