I've googled about 2 days and can't figure out how to set timeout for http://api.jqueryui.com/tooltip/ ???
Maybe i should use jquery hoverIntent ?
here is my code
$('*[class*="help_"]').tooltip({
    open: function(e,o){
        $(o.tooltip).mouseover(function(e){
            $('*[class*="help_"]').tooltip('open');
        });
        $(o.tooltip).mouseout(function(e){
        });         
    },
    close: function(e,o) {}
});