function makeSublist(parent,child,isSubselectOptional,childVal)
{
$("body").append("<select style='display:none' id='"+parent+child+"'></select>");
$('#'+parent+child).html($("#"+child+" option"));

	var parentValue = $('#'+parent).attr('value');
	$('#'+child).html($("#"+parent+child+" .sub_"+parentValue).clone());

childVal = (typeof childVal == "undefined")? "" : childVal ;
$("#"+child+' option[@value="'+ childVal +'"]').attr('selected','selected');

$('#'+parent).change( 
	function()
	{
		var parentValue = $('#'+parent).attr('value');
		$('#'+child).html($("#"+parent+child+" .sub_"+parentValue).clone());
		if(isSubselectOptional) $('#'+child).prepend("<option value='none'> -- Select -- </option>");
		$('#'+child).trigger("change");
					$('#'+child).focus();
	}
);
}

$(document).ready(function()
{
	makeSublist('child','grandsun', true, '');	
	makeSublist('parent','child', false, '1');	
});