datepicker automatic id assign

When attaching the date picker to a jQurey selection containing multiple items without id tag, the following code can assign the same id to all elements in the selection:

in _attachDatepicker function:

if (!target.id) target.id = 'dp' + new Date().getTime();

This happens when jQuery iterates through the items in the selection in the same millisecond. The result is a non functioning datepicker.

The solution would be to use a random number instead of Date().getTime().