function centeredWindow(path,breite,hoehe,scrollbars) {
var breite = breite;
var hoehe = hoehe;
var seite = (screen.availWidth - breite) / 2;
var oben = (screen.availHeight - hoehe) / 2;
params = ('width='+ breite
+',height='+ hoehe +',left='
+ seite +',top='+ oben +', scrollbars='+ scrollbars);
Fenster = window.open
(path,'name',params);
}


function showhide(id) {
	var closelast = true; // Klappt offene Menüs zu
	if(document.getElementById) {
		el = document.getElementById(id);
		if(el && el.style)	{
			level = id.split("_");
			level = level.length;
			if(lid[level] && closelast) {
				if(lid[level] != id) document.getElementById(lid[level]).style.display = "none";
			}
			lid[level] = id;
			el.style.display = (el.style.display == "none") ? "" : "none";
		}
	}
}

function change_textbox_size(size)
		{
			var el = document.getElementById("anliegen");
      var textboxhoehe = document.getElementById("textboxhoehe").value;
			var height = parseInt(el.style.height);
			if(!height && el.offsetHeight)
				height = el.offsetHeight;
			height += size;
			if(height < 20) 
				height = 20;
			el.style.height = height+"px";
      document.getElementById("textboxhoehe").value = height;
    }


function rech()
    {
    var groesse = document.getElementById("groesse").value;
    if(groesse == "" || groesse <= 0) alert('Bitte geben Sie Ihre Körpergrösse in cm an.')
    else {
    var laenge = groesse * 0.9 + 2.5
    document.getElementById("laenge").value = laenge}
    }