To answer your OP directly (not sure if it has been, I didn't notice it).
open_div = 'system'+k+'';
...
if ($(open_div).visible()==true) {
if there is no item with id 'system'+k then $(open_div) returns null
(correctly) and so $(open_div).visible() throws an error. (for example
if nothing has "id='system123'" then when k-123 the error wiil throw)
You can avoid it with:
if ($(open_div)) {
if ($(open_div).visible()==true) {
Dave
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