[MudWalker] Help With Tables

[Blastron]

Is it possible to sort one table, say table blah, by another table, 
table foo, so that items in table blah would appear in the order that 
they appear in table foo?  For instance, if table blah contained A, B, 
D, and F, and table foo contained F, A, E, B, D, and C (in that order), 
whatever function would do that would sort table blah as F, A, B, D.

Also, is there a function to see if a particular value exists within a 
table that would return true or false, or, better yet, the location of 
the value within the table or false?

Thanks for your help.