function changePrevOrNext(elem, prev_or_next) {
    for (var i = 1; i < 5; i++)
    {
        curr_num = 1;
        if ($(elem + i).visible())
        {
            curr_num = i;
            break;
        }
    }
    if (prev_or_next.toLowerCase() == 'next')
    {
        curr_num = curr_num + 1;
        if (curr_num > 4)
        {
            curr_num = curr_num - 4;
        }
    }
    if (prev_or_next.toLowerCase() == 'prev')
    {
        if (curr_num <= 1)
        {
            curr_num = 4;
        } else {
            curr_num = curr_num - 1;
        }
    }

    changeItemShow(elem, curr_num);
}

var autoMagazineID = "div_magazine|1"; 
var autoConferenceID = "div_conference|1";
function changeItemShow(elem, num){
  //var elemobj = $(elem + num);
  for (var i = 1; i < 5; i++)
  {
      if ($(elem + i).visible() && i != num)
      {
          ////Effect.Fold(elem + num)
          Effect.Appear(elem + num);
          Element.toggle(elem + i, elem + num);
          Effect.Fade(elem + i);
          $(elem + "_img" + i).src = 'images/scroll-circle.gif';
          $(elem + "_img" + num).src = 'images/scroll-circle-selected.gif';
          num = i;
          break;
      }
  }
  if (elem == 'div_magazine')
  {
      autoMagazineID = "div_magazine|"+num;
  } 
  if (elem == 'div_conference')
  {
      autoConferenceID = "div_conference|"+num;
  }
}

function autoMagzineScollor(){
  var tempArr = autoMagazineID.split("|");
  var tnum = parseInt(tempArr[1])+1;
  if (tnum > 4) tnum = 1;
  changeItemShow(tempArr[0], tnum);
} 
function autoConferenceScollor(){
  var tempArr = autoConferenceID.split("|");
  var tnum = parseInt(tempArr[1])+1;
  if (tnum > 4) tnum = 1;
  changeItemShow(tempArr[0], tnum);
}