function setContents(elem, text){
    if (elem){
        if(elem.firstChild)
            elem.firstChild.nodeValue = text
        else
            elem.innerHTML = text
    }
}

function start_stop(){
    if ( running ) {
        window.clearTimeout();
        createCookie('ssctrl', 'pause', 360);
        setContents( document.getElementById('play_pause'), 'Play' );
    }
    else {
        setTimeout('nextSlide()',5000);
        createCookie('ssctrl', 'play', 360);
        setContents( document.getElementById('play_pause'), 'Pause' );
    }
    running ^= true;
}

function nextSlide(){
    if (running)
        window.location = nextUrl;
}

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);
}

function setup(){
    if ( readCookie('ssctrl') == 'pause' ){
        running = false;
        setContents( document.getElementById('play_pause'), 'Play' );
    }
    else {
        running = true;
        setContents( document.getElementById('play_pause'), 'Pause' );
        setTimeout('nextSlide()', timeout);
    }
}


var running;
var timeout = (timeout) ? timeout*1000 : 15000;

window.onload=setup;