The script actually will already auto drop up a sub menu if it's too close to the browser's bottom edge. But if you're asking how to have them always drop up, inside anylinkmenu.js, find the below lines, and comment out the outer two lines:
Code:
//if (posy+this.dimensions.dropmenuh>this.dimensions.docscrolly+this.dimensions.docheight){ //drop up instead?
posy=Math.max(posy-this.dimensions.dropmenuh - (menu.orientation=="lr"? -this.dimensions.anchorh : this.dimensions.anchorh), this.dimensions.docscrolly) //position above anchor or window's top edge
//}
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