function popup(url,w,h) 
	{
	 var width  = w;
	 var height = h;
	 var left   = (screen.width  - width)/2;
	 var top    = (screen.height - height)/2;
	 var params = 'width='+width+', height='+height;
	 params += ', top='+top+', left='+left;
	 params += ', directories=no';
	 params += ', location=no';
	 params += ', menubar=no';
	 params += ', resizable=no';
	 params += ', scrollbars=yes';
	 params += ', status=no';
	 params += ', toolbar=no';
	 newwin=window.open(url,'windowname5', params);
	 if (window.focus) {newwin.focus()}
	 return false;
	}
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('location','city', false, '1');	
	});