function getobj(obj) {

	var curleft = curtop = 0;
	var curwidth = curheight = 0;

	if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		curwidth = obj.offsetWidth
		curheight = obj.offsetHeight
		
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}

	return [curleft,curtop,curwidth,curheight];
}

function openMenu(menu) {
	var area=getobj(menu);
	var dropdown=menu.getElementsByTagName('div').item(0);
	dropdown.className='dropdown_visible';	
	dropdown.style.left=area[0]+"px"; //left of menu option
	dropdown.style.top=((area[1] + area[3])) + "px";
}

function closeMenu(menu) {
	//menu.className='button_left_normal'; 
	menu.getElementsByTagName('div').item(0).className='dropdown_hidden';
}