Milonic JavaScript Menu

thank you Andy, it helped

Does anybody know, how to force menu to appear on the point where left mouse button mouse was pressed ?

For example:
addmenu(menu=[
"menu1",
100, //top
40, //left
50, //width
...
])

it means that menu will appear on the point X=40, Y=100.
But for example I loaded the page, pressed(clicked) left ...