Checkbox check all by name

Here is my fiddle which will select checkbox in the page.

But i wanted to check the group of checkbox with common class name.

Here is the Jsfiddle I have for that.

How can i achieve this ?

Here's the Script i have so far

$(document).ready(function(){
    $('.check:button').toggle(function(){
        $('input:checkbox').attr('checked','checked');
        $(this).val('uncheck all')
    },function(){
        $('input:checkbox').removeAttr('checked');
        $(this).val('check all');        
    })
})