Please note that official support for this menu version has now ceased. There are still plenty of users, though, and the forum is still running. Some of our long-time users may be able to help you out.
You could try calling the menu's built-in popup() function with the onload event in the page's <body> tag. If I recall correctly, popup("menuname") opens the specified menu in its defined location, and popup("menuname", 1) opens the specified menu at the mouse pointer's current location (caution: this will generate a position error if the pointer is not within the browser window when popup() runs).