Here is the simple extended method to achieve this functionality.
(function($){
function navigate(target){
var opts = $(target).calendar('options');
function navDate(step){
var date = opts.current;
if (date) {
date = new Date(date.getFullYear(), date.getMonth(), date.getDate() + step);
} else {
date = new Date();
}
$(target).calendar('moveTo', date);
}
$(target).attr('tabindex',1).bind('keydown', function(e){
switch(e.which){
case 38:
navDate(-7);
return false;
case 40:
navDate(7);
return false;
case 37:
navDate(-1);
return false;
case 39:
navDate(1);
return false;
}
})
}
$.extend($.fn.calendar.methods, {
nav: function(jq){
return jq.each(function(){
navigate(this);
})
}
})
})(jQuery);
Usage example:
$('#cc').calendar('nav');