lightbox-autocomplete

I am displaying a lightbox in which one textbox will come with autocomplete feature ... I gave that textbox id as "abc" and calling this abc in .aspx script like
$("#abc")

// don't navigate away from the field on tab when selecting an item
.bind("keydown", function (event) {
if (event.keyCode === $.ui.keyCode.TAB) {

if ($(this).autocomplete("widget")[0].style.display == 'block')
event.preventDefault();
}
})
.autocomplete{(
)}
Debug point is not hitting to <#abc>