function onMouseEnter(o1,event) {
	if (!o1.contains(event.fromElement))
		return true;
	return false;
}
				 
function onMouseLeave(o1,event) {
	if (!o1.contains(event.toElement))
		return true;
	return false;
}

function hide_optionsNorth (o1,event,objId){
	var o2 = document.getElementById (objId);	
	if (onMouseLeave (o1,event))
		o2.style.display= 'none';
}
			 
function show_optionsNorth (o1,event,objId){			
	if (onMouseEnter (o1,event)){	
		var o2 = document.getElementById (objId);	
		o2.style.display='block';		
		o2.style.width = o2.offsetWidth;
		o2.style.position = 'absolute';
       	o2.style.top = o1.offsetHeight;
    	o2.style.left = o1.offsetLeft;
	}	
}