function startScreens()
{
    var screen1 = document.getElementById("screen1");
    var screen2 = document.getElementById("screen2");
    var screen3 = document.getElementById("screen3");
    var screen4 = document.getElementById("screen4");
    var screen5 = document.getElementById("screen5");
    
    screen1.style.display="block";
    screen2.style.display="none";
    screen3.style.display="none";
    screen4.style.display="none";
    screen5.style.display="none";
    
    document.getElementById('light').style.display='block';
    document.getElementById('fade').style.display='block'
}

function closeScreens()
{
    document.getElementById('light').style.display='none';
    document.getElementById('fade').style.display='none';
    createCookie("EDIFlyer",1,30);
}

function nextScreen()
{
    var screen1 = document.getElementById("screen1");
    var screen2 = document.getElementById("screen2");
    var screen3 = document.getElementById("screen3");
    var screen4 = document.getElementById("screen4");
    var screen5 = document.getElementById("screen5");
    
    if(screen1.style.display=="block")
    {
        screen1.style.display="none";
        screen2.style.display="block";
    }
    else if(screen2.style.display=="block")
    {
        screen2.style.display="none";
        screen4.style.display="block";
    }
    else if(screen3.style.display=="block")
    {
        screen3.style.display="none";
        screen4.style.display="block";
    }
    else if(screen4.style.display=="block")
    {
        screen4.style.display="none";
        screen5.style.display="block";
    }
    return;
}

function prevScreen()
{
    var screen1 = document.getElementById("screen1");
    var screen2 = document.getElementById("screen2");
    var screen3 = document.getElementById("screen3");
    var screen4 = document.getElementById("screen4");
    var screen5 = document.getElementById("screen5");
    
    if(screen5.style.display=="block")
    {
        screen5.style.display="none";
        screen4.style.display="block";
    }
    else if(screen4.style.display=="block")
    {
        screen4.style.display="none";
        screen2.style.display="block";
    }
    else if(screen3.style.display=="block")
    {
        screen3.style.display="none";
        screen2.style.display="block";
    }
    else if(screen2.style.display=="block")
    {
        screen2.style.display="none";
        screen1.style.display="block";
    }
    return;
}

function handleFlyer()
{
    adjustFlyerPosition();
    //var ret = readCookie("EDIFlyer");
    //if(ret==null)
    //{
    //    startScreens();
    //}
    //else
    //{
    //   
    //}
}

function adjustFlyerPosition()
{
    var flyerDisplay = document.getElementById("light");
    flyerDisplay.style.left = (screen.width-500)/2;
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}