To select tabs:
if (navigator.userAgent.indexOf('gonative') > -1) {window.location.href = 'gonative://tabs/select/1';}
Note that the tabs are 0-indexed, i.e. tabs/select/1 will select the second tab
To change the tabs:
var tabs = {"enabled": true,"items": [{"icon": "fa-cloud","label": "Tab 1","url": "javascript:alert('You selected tab 1')"}, {"icon": "fa-globe","label": "Tab 2","url": "javascript:alert('You selected tab 2')"}, {"icon": "fa-users","label": "Tab 3","url": "javascript:alert('You selected tab 3')"}]};​var json = JSON.stringify(tabs);window.location.href='gonative://tabs/setTabs?tabs=' + encodeURIComponent(json);
To hide the tabs, set "enabled" to false.