Calling modal window by click on item in menu

[BlackberryMuffin]

I'm writing web app on ASP.NET WebForms.On client-side I'm using Twitter Bootstrap.I know how to call modal window by click on a button,etc, but I have no idea how to call a modal window when I click on item in my menu.Menu

• item1
• item2

Click on item1 --> calling modal window AClick on item2 --> calling modal window BThanks.