function showArticleMenu(div, obj) {
	div = document.getElementById(div);

	if (div.style) {
		correctPosMenu(div, obj);
		div.style.display = 'inline';
	}
}

function hideArticleMenu(div) {
	setVisibility(div, 'hide');
}

function correctPosMenu(div, obj) {
	var oLeft = obj.offsetLeft; 
	var oTop = obj.offsetHeight + ((obj.offsetTop > 0) ? (obj.offsetTop * 2)-1 : 0);
	
	while(obj.offsetParent!=null) {   // Parse the parent hierarchy up to the document element
		oParent = obj.offsetParent;    // Get parent object reference
		oLeft += oParent.offsetLeft; // Add parent left position
		oTop += oParent.offsetTop;
		obj = oParent;
	}
	
	div.style.top = oTop;
	div.style.left = oLeft;
}

function showSubMenu(obj, sel, last) {
	var i = 0;
	for (i=0; i<last; i++) {
		vis = (sel == i) ? '' : 'hide';
		setVisibility(obj + i, vis);
	}
}

function setVisibility(obj, vis) {
	obj = document.getElementById(obj);
	if (obj.style) {
		obj.style.display = (vis != 'hide') ? 'block' : 'none';
	}
}