var imgObj;
function over(imgNum) {

	if(menuReadyState) {

		//find image object
		imgObj = document.images["b"+imgNum];

		//find position of image
		xPos = getRealLeft(imgObj);
		yPos = getRealTop(imgObj);

		//activate menu with returned co-ordinates
		activateMenu(imgNum,xPos,yPos+imgObj.height);

		}

	}