$(function(){var a=$("#optlist option").map(function(){return[[this.value,$(this).text()]]});$("#someinput").keyup(function(){var b=new RegExp($("#someinput").val(),"i"),c=$("#optlist").empty();a.each(function(){b.test(this[1])&&c.append($("<option/>").attr("value",this[0]).text(this[1]))})})});