var objSelect = document.getElementById(ele);
var Item = new Option("", "");
objSelect.options[objSelect.length] = Item;
var Item = new Option("a", "1");
objSelect.options[objSelect.length] = Item;
var Item = new Option("b", "2");
objSelect.options[objSelect.length] = Item;
var Item = new Option("c", "3");
objSelect.options[objSelect.length] = Item;