function fontSizeChange(s){
	var firstSize = 12;
document.body.style.fontSize=s + "px";
}


function fontColorChange(s){
document.body.style.color=s;
}


/*--------------ページトップへスクロール--------------------*/

var play_cnt = 0;

function get_obj_y(target){

  $gosa = 0; //微調整の値px

  var pos = bytefx.$position(document.getElementById(target));
  return pos.y + $gosa;
}

function softScrollBack(top) {

  play_cnt++;
  softScrollBackExec(top, play_cnt, 0);
}

function softScrollBackExec(top, play_no, scrj) {

  if(play_cnt > play_no){
    //### console.log("play_cnt="+ play_cnt +" : play_no="+ play_no);
    return false;
  }

  if(navigator.appName == "Microsoft Internet Explorer" && document.compatMode == "CSS1Compat") {
    var scdist = document.body.parentNode.scrollTop;
  } else if(navigator.appName == "Opera") {
    var scdist = document.body.parentNode.scrollTop;
  } else if(navigator.appName == "Netscape" && navigator.userAgent.indexOf("Safari") != -1) {
    var scdist = document.body.scrollTop;
  } else if(navigator.appName == "Netscape" && document.compatMode == "CSS1Compat") {
    var scdist = document.body.parentNode.scrollTop;
  } else {
    var scdist = document.body.scrollTop;
  }


  if(scdist >= top){
    scdist = scdist - top;
    flag = -1;
    point = 0.2;
  } else{
    scdist = top - scdist;
    flag =  1;
    point = 0.2;
  }

  if(scrj<50 && scdist>0){
     scdist = (scdist>2) ? Math.ceil(scdist*point) : 1;
     scrj++;
     scrollBy(0,flag * scdist);
     //### console.log((flag * scdist));
     //### console.log("play_cnt="+ play_cnt +" : play_no="+ play_no);
     var timerID = setTimeout("softScrollBackExec(" + top +","+ play_no +","+ scrj +")", 20);
  }
  
function handle(delta) {
        if (delta < 0)
                // 下方向にまわした場合の処理
               clearTimeout(timerID);
        else
                // 上方向にまわした場合の処理
                clearTimeout(timerID);
}


function wheel(event){
        var delta = 0;
        if (!event) /* For IE. */
                event = window.event;
        if (event.wheelDelta) { /* IE/Opera. */
                delta = event.wheelDelta/120;
                if (window.opera)
                        delta = -delta;
        } else if (event.detail) { /** Mozilla case. */
                delta = -event.detail/3;
        }

        if (delta)
                handle(delta);
}

	if (window.addEventListener) window.addEventListener('DOMMouseScroll', wheel, false);
	window.onmousewheel = document.onmousewheel = wheel;

}