sub-menu recognizing window height

Hi

Does anyone know or has anyone come across a way of having the sub-menu move items into new column when they extend further than the window height? ie: below the bottom of the window

From what i can gather seeing as a <ul><li> is created the only way would be for something to recognize the window.height and offset a certain number of <li> that fall below the bottom of the window or create a new div to house them in.

Cant seem to find this as an option or additional to superfish and wanted to know if it exists before i start trying to tweak the code

Thanks