column filtering

gatchina

hi,
I have a question regarding this example: http://datatables.net/examples/api/multi_filter_select.html

If you use this example, and select first an office, ex. London. and then clear this filter again. the table doesn't show all entries anymore. It gets worse, if you select a person after this...it wil not find anyone anymore.
Is there a normal reset function? Which wil show all the table entries again.
Next to this question, is there a method to combine this with a query to a backend...when i use:
var table = $('#example').dataTable( {
"ajax": "back.php"
} );

And then the rest of the script it hangs, on this line:
table.column( i ).data().unique().sort().each( function ( d, j ) {

With the error: TypeError: table.column is not a function
the table is filled with data anyway.

thanks in Advance.