gistfile1.js

YUI().use(
'aui-modal',
function(Y) {

    var modal1 = new Y.Modal(
      {
        bodyContent: '<button id="inModalButton">foo</button>',
        headerContent: 'Modal header',
        render: '#modal',
      }
    ).render();

    var modal2 = new Y.Modal(
      {
        headerContent: 'Modal header',
        toolbars: {
            body: [
                { label: 'Body' }
            ],
            footer: [
                { icon: 'Footer' }
            ]
        },
        render: '#modal',
      }
    ).render();

  }
);