<select id="select">
	<option value="sssssxsssss" aa="dddd"  bb="ddddfsdfs">ssssssssss</option>
	<option value="mmmmmmmmmxmm" aa="ddddasd" bb="sadasf" >mmmmmmmmm</option>
	<option value="ömmmxm" aa="sader" bb="sdsasfwe">ömmmmm</option>
	</select>

$("#select").change(function(){
alert($("#select option:selected").attr("aa"))
})