function $(id) { return document.getElementById(id); }

function addLoadEvent(func){
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function(){
			oldonload();
			func();
		}
	}
}

function moveElement(elementID,final_x,final_y,interval) {
  if (!document.getElementById) return false;
  if (!document.getElementById(elementID)) return false;
  var elem = document.getElementById(elementID);
  if (elem.movement) {
    clearTimeout(elem.movement);
  }
  if (!elem.style.left) {
    elem.style.left = "0px";
  }
  if (!elem.style.top) {
    elem.style.top = "0px";
  }
  var xpos = parseInt(elem.style.left);
  var ypos = parseInt(elem.style.top);
  if (xpos == final_x && ypos == final_y) {
		return true;
  }
  if (xpos < final_x) {
    var dist = Math.ceil((final_x - xpos)/10);
    xpos = xpos + dist;
  }
  if (xpos > final_x) {
    var dist = Math.ceil((xpos - final_x)/10);
    xpos = xpos - dist;
  }
  if (ypos < final_y) {
    var dist = Math.ceil((final_y - ypos)/10);
    ypos = ypos + dist;
  }
  if (ypos > final_y) {
    var dist = Math.ceil((ypos - final_y)/10);
    ypos = ypos - dist;
  }
  elem.style.left = xpos + "px";
  elem.style.top = ypos + "px";
  var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";
  elem.movement = setTimeout(repeat,interval);
}

function classNormal(bannerBtnID,bannerTxID){
	var bannerBtns= $(bannerBtnID).getElementsByTagName('li');
	var bannerTxs = $(bannerTxID).getElementsByTagName('li');
	for(var i=0; i<bannerBtns.length; i++) {
		bannerBtns[i].className='normal';
		bannerTxs[i].className='normal';
	}
}

function classCurrent(bannerBtnID,bannerTxID,n){
	var bannerBtns= $(bannerBtnID).getElementsByTagName('li');
	var bannerTxs = $(bannerTxID).getElementsByTagName('li');
	bannerBtns[n].className='current';
	bannerTxs[n].className='current';
}

function bannerChange() {
	if(!$('banner')) return false;
	$('banner').onmouseover = function(){atuokey = true};
	$('banner').onmouseout = function(){atuokey = false};
	var bannerBtns = $('banner_btn').getElementsByTagName('li');
	var listLength = bannerBtns.length;
	bannerBtns[0].onmouseover = function() {
		moveElement('banner_piclist',0,0,5);
		classNormal('banner_btn','banner_tx');
		classCurrent('banner_btn','banner_tx',0);
	}
	if (listLength>=2) {
		bannerBtns[1].onmouseover = function() {
			moveElement('banner_piclist',0,-167,5);
			classNormal('banner_btn','banner_tx');
			classCurrent('banner_btn','banner_tx',1);
		}
	}
	if (listLength>=3) {
		bannerBtns[2].onmouseover = function() {
			moveElement('banner_piclist',0,-334,5);
			classNormal('banner_btn','banner_tx');
			classCurrent('banner_btn','banner_tx',2);
		}
	}
}

setInterval('autobanner()',3000);
var atuokey = false;
function autobanner() {
	if(!$('banner')) return false;
	if(atuokey) return false;
	var focusBtnList = $('banner_btn').getElementsByTagName('li');
	var listLength = focusBtnList.length;
	for(var i=0; i<listLength; i++) {
		if (focusBtnList[i].className == 'current') var currentNum = i;
	}
	if (currentNum==0&&listLength!=1 ){
		moveElement('banner_piclist',0,-167,5);
		classNormal('banner_btn','banner_tx');
		classCurrent('banner_btn','banner_tx',1);
	}
	if (currentNum==1&&listLength!=2 ){
		moveElement('banner_piclist',0,-334,5);
		classNormal('banner_btn','banner_tx');
		classCurrent('banner_btn','banner_tx',2);
	}
	if (currentNum==2&&listLength!=3 ){
		moveElement('banner_piclist',0,-501,5);
		classNormal('banner_btn','banner_tx');
		classCurrent('banner_btn','banner_tx',3);
	}
	if (currentNum==3 ){
		moveElement('banner_piclist',0,0,5);
		classNormal('banner_btn','banner_tx');
		classCurrent('banner_btn','banner_tx',0);
	}
	if (currentNum==1&&listLength==2 ){
		moveElement('banner_piclist',0,0,5);
		classNormal('banner_btn','banner_tx');
		classCurrent('banner_btn','banner_tx',0);
	}
	if (currentNum==2&&listLength==3 ){
		moveElement('banner_piclist',0,0,5);
		classNormal('banner_btn','banner_tx');
		classCurrent('banner_btn','banner_tx',0);
	}
}
addLoadEvent(bannerChange);