var prevSlide = 0;
var curSlide = 1;
var maxSlides = 6;

var slideTime = 3; //seconds
var fadeTime = 300; //miliseconds


$(document).ready(init);

function init()
{
    setTimeout("slide()", slideTime*1000);
    $(".screens").click(goToSlides);
}

function goToSlides()
{
    leftVal = (screen.width - 900) / 2;
    topVal = (screen.height - 650) / 2;
    window.open("slide1.html","Window1","width=900,height=650,menubar=no,toolbar=no,resizable=no,left="+leftVal+", top="+topVal);
    return false;
}

function slide()
{
    prevSlide = curSlide;
    if (curSlide<maxSlides)
        curSlide++;
    else
        curSlide = 1;
        
    $("#screen_"+prevSlide).css("z-index",10);
    $("#screen_"+curSlide).css("z-index",22);
    $("#screen_"+curSlide).animate({"opacity":1}, fadeTime, finishAnim);
}

function finishAnim()
{
    $("#screen_"+prevSlide).css("opacity",0);
    setTimeout("slide()", slideTime*1000);
}