Question : undefined error help

i am getting an error according to firebug of 'id_con is undefined'.i have made sure all entries are correct and i cannot see how to fix this error. i would be grateful if someone could show me how to correct this error. the error is occuring on this line:

itemlist+= items[i].id_con.substr(3)+",";

many thanks
code file

Answer : undefined error help

sorry. might want to give what?

could you do an example based on my code?

many thanks for replies.
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