checking Checkboxes issue

[anonymous]

Requirement:If main checkbox is checked,then all other checkboxes should be checked and vice versa.

it is working as expected for first 2 or 3 times but if we repeat this(checking and unchecking) further,it is not working.

please visit the demo here.

​http://jsfiddle.net/nagasrihari/Te9bg/

[fastfasterfastest]

Use .prop instead of .attr. See ​http://api.jquery.com/prop/

[timmywil]

Duplicate of #13573.