var imgHome_On = new Image();
var imgProducts_On = new Image();
var imgSupport_On = new Image();
var imgAbout_On = new Image();

imgHome_On.src = "images/menu/home_on.jpg";
imgProducts_On.src = "images/menu/products_on.jpg";
imgSupport_On.src = "images/menu/support_on.jpg";
imgAbout_On.src = "images/menu/about_on.jpg";

function showMenu(index) {
  objMenuButton = document.getElementById("menu_"+index)
  objMenu = document.getElementById("submenu_" + index);
  objMenu.style.display = "inline";
  objMenu.style.left = findPos(objMenuButton)[0] + (objMenuButton.offsetWidth / 2) - (objMenu.offsetWidth / 2) + 6
}

function hideMenu(index) {
  objMenu = document.getElementById("submenu_" + index);
  objMenu.style.display = "none";

}

function findPos(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}
	return [curleft,curtop];
}

function toggleNAPAerial() {

  objNAP = document.getElementById("nap_aerial");
  objContent1 = document.getElementById("content1");
  if (objNAP.style.display=="inline") {
    objNAP.style.display = "none";
  } else {
    objNAP.style.display = "inline";
    objNAP.style.left = findPos(objContent1)[0];
    objNAP.style.top = findPos(objContent1)[1];
  }

}