var IE6 = true;

function startMenu(){
  var browser = navigator.appName;
  var version = navigator.appVersion.substring(22,25);
  if (browser !== 'Microsoft Interet Explorer' && version !== '6.0'){
		  document.getElementById('overlay').style.position = 'fixed';
		  IE6 = false;
	}
}

window.onscroll = function()
{
	resizeBackground();
	centerDiv();	
}

window.onresize = function()
{
	resizeBackground();
	centerDiv();
}

var myHeight;
var myWidth;
var beginFade = .1;
var currentFade = beginFade;
var endFade = .80
var interval = 10;


function resizeBackground()
{
	document.getElementById('overlayBG').style.width = '100%';
	document.getElementById('overlayBG').style.height = '100%';
}

function centerDiv()
{
	if(document.body.clientHeight)
	{
		var myHeight = parseInt((document.documentElement.clientHeight-375)/2);
		var myWidth = parseInt((document.body.clientWidth-600)/2);
	}
	else
	{
		var myHeight = parseInt((window.innerHeight-375)/2);
		var myWidth = parseInt((window.innerWidth-600)/2);
	}	

  if(IE6){
  	if(document.documentElement && document.documentElement.scrollTop){
		    myHeight = myHeight + document.documentElement.scrollTop;
    }
  }
	
  document.getElementById('overlay').style.left = myWidth +'px';
	document.getElementById('overlay').style.top = myHeight +'px';
}


function myFunction(pizzaImg, pizzaName)
{
	
  document.getElementById('overlayTitle').innerHTML = pizzaName;
  document.getElementById('overlayImage').src = pizzaImg;
  document.getElementById('overlayImage').alt = pizzaName;
  document.getElementById('overlayBG').style.visibility = 'visible';
	fadeUp();
	centerDiv();
}

function fadeUp()
{

	if(!document.getElementById) return false;
	if(!document.getElementById('overlayBG')) return false;

	var fadeElement = document.getElementById('overlayBG');
	var overlayElement = document.getElementById('overlay');
	if(fadeElement.fade)
	{
		clearTimeout(fadeElement.fade);
	}

	if(currentFade < endFade)
	{
		fadeElement.style.opacity = currentFade;
		fadeElement.style.filter="alpha(opacity="+currentFade * 100 + ")";     
		currentFade = currentFade + .2
	}
	else
	{
	  document.getElementById('overlay').style.visibility = 'visible';
		return false;
	}

fadeElement.fade = setTimeout(fadeUp, interval)
     
      if(IE6){	
      var test = document.getElementById('wrapperHomePage');
    	 test.style.filter ="progid:DXImageTransform.Microsoft.BasicImage(Opacity=.3)";
      }
}

function closeWindow()
{
	currentFade = 0;
	document.getElementById('overlayBG').style.visibility = 'hidden';
	document.getElementById('overlay').style.visibility = 'hidden';
	if(IE6){	
      var test = document.getElementById('wrapperHomePage');
    	 test.style.filter ="progid:DXImageTransform.Microsoft.BasicImage(Opacity=1)";
      }
	return;
}