var half__ = document.getElementById("ifs_0").clientWidth/2;
var left1__ = document.getElementById("ifs_0").offsetLeft;
var left2__ = document.getElementById("flags").offsetLeft;
var left3__ = document.getElementById("tmenu").offsetLeft;
var width__ = document.getElementById("tmenu").clientWidth/2;
var tmenu = document.getElementById("tmenu");
tmenu.style.left = (left1__ + half__ + left2__ - left3__ - width__)+"px";