@haejin the mouse pointer is visible as soon as its hovered over a pop up or the side of the panel so you should be able to select the menu options just fine. These trolls on your page are ruthless! and no its not a virus, the code is self explanatory

$('td.chart-markup-table.pane')[0].setAttribute("style", "cursor:none");

1. select all elements matching the class name td, chart-markup-table and pane
2. [0] selects the first element that is returned. only one is returned anyways
3. setattribute sets the cursor style for the attribute you just selected