Uncaught ReferenceError: is not defined

[diurno10]

function borrar(tag) {
//console.log(tag.parent().text());
var v_search = $('search-field').val();
$(tag).parent().remove();
}


$('#search-field').keypress(function(event) {
if (event.which == '13') {
if ($(this).val() != '') {
$('<li class="addedTag">' + $(this).val() + '<span class="tagRemove" onclick="return borrar($(this))">x</span><input type="hidden" value="' + $(this).val() + '" name="tags[]"></li>').insertBefore('.tags .tagAdd');
$(this).val('');

}
}
});