function on_mouse_move(event) {
if (event.clientX > [XSTART] && event.clientX < [XEND]) { document.getElementById("cursor_line").setAttribute("display","inherit"); document.getElementById("cursor_line").setAttribute("transform", "translate(" + event.clientX + ", 0)"); } else { document.getElementById("cursor_line").setAttribute("display","none"); }
} function null_handler(event) {}