This is simple. Change your source to an array of objects, such as:
var source = [ { value: "www.foo.com",
label: "Spencer Kline"
},
{ value: "www.example.com",
label: "James Bond"
},
...
];
The just use the select method to redirect to the ‘value’, e.g.:
$(document).ready(function() {
$("input#autocomplete").autocomplete({
source: source,
select: function( event, ui ) {
window.location.href = ui.item.value;
}
});
});