function makeSublist(parent,child,isSubselectOptional)
	{
		$("body").append("<select style='display:none' id='"+parent+child+"'></select>");
		$('#'+parent+child).html($("#"+child+" option"));
		$('#'+child).html("<option> --- </option>");		
		$('#'+parent).change(
			function()
			{
				var parentValue = $('#'+parent).attr('value');
				$('#'+child).html($("#"+parent+child+" .sub_"+parentValue).clone());
				if(isSubselectOptional) $('#'+child).prepend("<option> -- Select -- </option>");
			}
		);
	}

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