This are (in short) my elements:

<input type="checkbox" size="4" id="checkbox-users" name="users[]" 
value="1"/> 
<input type="checkbox" size="4" id="checkbox-users" name="users[]" 
value="2"/> 
<input type="checkbox" size="4" id="checkbox-users" name="users[]" 
value="3"/>
The code is:

$.each($('#checkbox-users'), function(key, value){value.click();})

or:

$('#checkbox-users').each(function(key, value){value.click()})

check only the first checkbox-users

what do I wrong?