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(){
	var focusBtnList = $Id('focus_change_btn').getElementsByTagName('li');
	for(var i=0; i<focusBtnList.length; i++) {
		focusBtnList[i].className='';
	}
}
var img_w = 300;
function focusChange() {
	var focusBtnList = $Id('focus_change_btn').getElementsByTagName('li');
	for(var k=0; k<focusBtnList.length; k++){
		var step = 0-k*img_w;
		focusBtnList[k].id = k+"_"+step;
		focusBtnList[k].onmouseover =function() {
			var arr = this.id.split('_');
			var id = parseInt(arr[0]);
			var step = parseInt(arr[1]);
			moveElement('focus_change_list',step,0,5);
			classNormal();
			focusBtnList[id].className='current';
		}
	}
}
//setInterval('autoFocusChange()', 5000);
function autoFocusChange() {
	var focusBtnList = $Id('focus_change_btn').getElementsByTagName('li');
	var k,step;
	for(var i=0; i<focusBtnList.length; i++) {
		if (focusBtnList[i].className == 'current') {
			k = i+1;
			step = 0-k*img_w;
			if(k==focusBtnList.length){
				k=step=0;
			}
		}
	}
	
	moveElement('focus_change_list',step,0,5);
	classNormal();
	focusBtnList[k].className='current';
}
window.onload=function(){
	focusChange();
}