$(function () {
    var returnsValue; // Type:  wijtabs
    // Parameters
    var url; // Type:  string
    var label; // Type:  string
    var index; // Type:  number
    
    returnsValue = $(".selector").wijtabs("add", url, label, index);
});

function add( 
   url : string,
   label : string,
   index : number
) : wijtabs;

Parameters

url

A URL consisting of a fragment identifier only to create an in-page tab or a full url (relative or absolute, no cross-domain support) to turn the new tab into an Ajax (remote) tab.

label

The tab label.

index

Zero-based position where to insert the new tab.

Reference

wijtabs type
wijtabs jQuery Widget