keynav | - Control the mouse with the keyboard | Keyboard library

What i'm trying to do is that, i'm using arrow keys to set focus to next/previous tabs. i'm using javascript .focus() method to set the focus on to the element using the ID.

i'm getting the active tab id, but i need to get the previous and next tab ids' so that i can set focus. but i'm not able to get the previous and next tab id's

i'm getting Cannot read property 'id' of null error when i tried.

here is what i have tried.

initEvents: function(){ this.callParent(arguments);