function Showtooltip (elt,txt) {

	var btn = document.getElementById(elt);
	var header = document.getElementById("topmenus");

	var divAll = document.createElement('DIV');
	
	divAll.className = "tooltip";

	divAll.style.width = txt.length*6+"px";
	divAll.style.position = "absolute";

	document.getElementById("topmenus").appendChild(divAll);	

	divAll.innerHTML = txt;
	
	divAll.style.top = btn.parentNode.offsetTop-divAll.offsetHeight+"px";
	divAll.style.left = btn.parentNode.offsetLeft-divAll.offsetWidth/2+12+"px";
	

	btn.onmouseout = function () {
		Hidetooltip (divAll);
	}

}

function Hidetooltip (elt) {
	elt.parentNode.removeChild(elt);
}