// ============================
// === Navigationssteuerung ===
// ============================

function SubNav() {
		if (this.className == "nav-button") {
				var divObj = document.getElementsByTagName("div");
				for (var i = 0; i < divObj.length; i++) {
						if (divObj[i].getAttributeNode("id")) {
   					if (divObj[i].getAttributeNode("id").nodeValue == this.name) {
   							if (divObj[i].style.display == "block") {
   									divObj[i].style.display = "none";
   							} else {
   									divObj[i].style.display = "block";
   							}
   					}
   			}
   	}
		} else if (this.className == "nav-sub") {
				if (this.style.display == "block") {
   			this.style.display = "none";
   	} else {
   			this.style.display = "block";
   	}
		}
}

function Init() {
  if (document.getElementById) {
    var divElements = document.getElementsByTagName("div");
    for (var i = 0; i < divElements.length; i++) {
      if (divElements[i].className == "nav-sub") {
       divElements[i].onmouseover = SubNav;
       divElements[i].onmouseout = SubNav;
      }
    }
    var aElements = document.getElementsByTagName("a");
    for (var i = 0; i < aElements.length; i++) {
      if (aElements[i].className == "nav-button") {
        aElements[i].onmouseover = SubNav;
        aElements[i].onmouseout = SubNav;
      }
    }
  } else {
    alert("Ihr Browser unterstuetzt die Funktionaliaet dieser \nWebsite nicht! Verwenden Sie einen aktuelleren Browser.");
  }
}

window.onload = Init;