mousedownDt.column(0).headerCell(0).mouseDown();
assertTrue(selenium.isTextPresent("headerOnmousedown works"));
assertTrue(selenium.isTextPresent("mousedown"));
// headeronmouseup
mousedownDt.column(0).headerCell(0).mouseUp();
assertTrue(selenium.isTextPresent("headerOnmouseup works"));
assertTrue(selenium.isTextPresent("mouseup"));
// headeronmouseover
dataTable("fn:mouseoverDT").column(0).headerCell(0).mouseOver();