// JavaScript Document

var MainMenuSelectedItem = 0;
var MainMenuHideTimer = null;
var TimeToFade = 1000.0;

function fade(element){
  //var element = document.getElementById(eid);
  if(element == null)
    return;
	
  eid = element.id;
   
  if(element.FadeState == null)
  {
    if(element.style.opacity == null
        || element.style.opacity == ''
        || element.style.opacity == '1')
    {
      element.FadeState = 2;
    }
    else
    {
      element.FadeState = -2;
    }
  }
   
  if(element.FadeState == 1 || element.FadeState == -1)
  {
    element.FadeState = element.FadeState == 1 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade - element.FadeTimeLeft;
  }
  else
  {
    element.FadeState = element.FadeState == 2 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade;
    MainMenuHideTimer = setTimeout("animateFade(" + new Date().getTime() + ",'" + eid + "')", 33);
  }  
}

function animateFade(lastTick, eid){  
  var curTick = new Date().getTime();
  var elapsedTicks = curTick - lastTick;
 
  var element = document.getElementById(eid);
 
  if(element.FadeTimeLeft <= elapsedTicks)
  {
    element.style.opacity = element.FadeState == 1 ? '1' : '0';
    element.style.filter = 'alpha(opacity = '
        + (element.FadeState == 1 ? '100' : '0') + ')';
    element.FadeState = element.FadeState == 1 ? 2 : -2;
    return;
  }
 
  element.FadeTimeLeft -= elapsedTicks;
  var newOpVal = element.FadeTimeLeft/TimeToFade;
  if(element.FadeState == 1)
    newOpVal = 1 - newOpVal;

	setOpacity(element, newOpVal);
 
  MainMenuHideTimer = setTimeout("animateFade(" + curTick + ",'" + eid + "')", 33);
}

function setOpacity(element, opacity){
  //console.log(opacity);
  element.style.webkitTransform='rotate(360deg)';
  element.style.Opacity = opacity;
  element.style.MozOpacity = opacity;
  element.style.KhtmlOpacity = opacity;
  element.style.filter = 'alpha(opacity = ' + (opacity*100) + ')';
  element.style.webkitOpacity = opacity;
  if(opacity < .05) element.style.display = "none";
}

function hide(elem){
	MainMenuHideTimer = setTimeout("document.getElementById('" + elem.id + "').style.display = 'none';",1000);
}
function mainmenu_leave(){
	fade(document.getElementById('submenu' + MainMenuSelectedItem));
}

function mainmenu_hover(id){
	if(!id) id = MainMenuSelectedItem;
	
	if(MainMenuHideTimer){
		clearTimeout(MainMenuHideTimer);
		MainMenuHideTimer = null;
	}
	
	for(i=1;i<=6;i++){
		var elem = document.getElementById('submenu' + i)
		elem.style.display = i==id?'block':'none';
		elem.FadeState = null;
		setOpacity(elem, 1);
	}
	
	MainMenuSelectedItem = id;
}


function screenNumbers(evt){ //for use with:  onkeypress="return screenNumbers(event);"
	var e = evt;
	var charCode = e.which || e.keyCode || e.charCode;
	console.log(charCode);
	if (charCode > 31 && (charCode < 48 || charCode > 57) && !(charCode == 37 || charCode == 39 || charCode == 46 || charCode == 13))
		return false;
	
	return true;
}