Description:
 This code is to tooltip drop down option when mouse over. TooltipClass uses json data source .
If this datasource is empty will fetch from ajax url passed from source list url.

You can set a template for each tooltip for drop down box.

sample source params to select particular select box.

Usage:
var dataSourceList = {
    'portfolio': {
        'targetElement': '#analysisjob_portfolio_id',
        'url': '/portfolios',
        'sourceName': 'portfolio',
        'primaryKey': 'portfolio.PortfolioId',
        'jasonData': {},
        'template': "" +
            "<%= item.Name%>" + "<br/>" +
            "<i><%= item.Description%></i>" + "<br/>" +
            ""
     }
}
targetElement : select box id
url: ajax url to fetch data
sourceName: json root
primaryKey: key with which we search for json data for each option
template: you can define tooltip structure

loadSource and call tooltipify function like this :
       var source = dataSourceList.portfolio
       var test = TooltipClass.initialize(source);
        test.toolTipfy();

Requirements:
http://twitter.github.com/bootstrap/javascript.html (tooltip,popover)
jquery
underscore.js

tested in firefox