var oldSlide = "1";
var intervalID = "";
function getE(objn) { return getElementById(objn); }
function showSlider(inum) {
    showSlideGo(inum);
    intervalID = $clear(intervalID);
}
function makeNoOpac(obj_name,endval) {
    if(!endval) { endval = 1; }
    var myEffects = new Fx.Morph(obj_name, {duration: 500, transition: Fx.Transitions.Sine.easeOut});
    myEffects.start({ 'opacity': [0,endval]});
}
function makeOpac(obj_name,e) {
    var myEffects = new Fx.Morph(obj_name, {duration: 500, transition: Fx.Transitions.Sine.easeOut});
    myEffects.start({ 'opacity': [1,0]});
}
function rotateSlide() {
    oldSlideNew = parseInt(oldSlide) + 1;
    if(oldSlideNew > 5) {
        oldSlideNew = "1";
    }
    showSlideGo(oldSlideNew);
}
function showSlideGo(inum) {
    if(inum != oldSlide) { 
        makeOpac('slide_' + oldSlide);
        makeNoOpac('slide_' + inum);
        el = $('choice_' + oldSlide)  ;
        el.className = "";
        oldSlide = inum;  
        el = $('choice_' + inum)  ;
        el.className = "selected";
    }
}
window.addEvent('domready', function() {
   makeOpac('slide_2');
   makeOpac('slide_3');
   makeOpac('slide_4');
   makeOpac('slide_5');
   
   intervalID = rotateSlide.periodical(5000);
});