function Menu(id) {
	if (id == "t1") {
	var men = "tit1";
	var md = "tit2";
	var ms = "tit3";
	var mq = "tit4";
	} else if (id == "t2") {
	var men = "tit2";
	var md = "tit1";
	var ms = "tit3";
	var mq = "tit4" 
	} else if (id == "t3") {
	var men = "tit3";
	var md = "tit2";
	var ms = "tit1";
	var mq = "tit4";
	} else {
	var men = "tit4";
	var md = "tit3";
	var ms = "tit2";
	var mq = "tit1";
	}
var e = document.getElementById(id);
var a = document.getElementById(men).getElementsByTagName("span");
var b = document.getElementById(md).getElementsByTagName("span");
var c = document.getElementById(ms).getElementsByTagName("span");
var d = document.getElementById(mq).getElementsByTagName("span");
var t = e.style.display;
	if (t == "block") {
		if (a[0].className == "elem") {
		a[0].style.display = "none";
		}
		if (b[0].className == "elem") {
		b[0].style.display = "none";
		}
		if (c[0].className == "elem") {
		c[0].style.display = "none";
		}
		if (d[0].className == "elem") {
		d[0].style.display = "none";
		}
	} else 	{
          	if (b[0].className == "elem") {
               	b[0].style.display = "None";
            	}
            	if (c[0].className == "elem") {
               	c[0].style.display = "None";
            	}
             	if (d[0].className == "elem") {
               	d[0].style.display = "None";
            	}
        e.style.display = "Block";
	}
}