var banner_speed = 1		
var banner_term = 16;		

var speed_obj = banner_speed;
var banner_width ='177'
var blockArea = '';
var noneArea = '';
var banner_interval = '';

function initLeftBanner(){
	initBanner();
	noneArea.style.left = (banner_width+banner_term)+'px';
	banner_interval = setInterval("leftmove()",30);
}

function initRightBanner(){
	initBanner();
	noneArea.style.position = 'absolute';
	noneArea.style.left = -(banner_width+banner_term)+'px';
	banner_interval=setInterval("rightmove()",30);
}

function initBanner(){
//	var banner_data = document.getElementById('banner_data').innerHTML;
	blockArea = document.getElementById("blockArea");
	noneArea = document.getElementById("noneArea");
//	blockArea.innerHTML = noneArea.innerHTML = banner_data;
	banner_width = blockArea.offsetWidth;
	blockArea.style.left = '0px';
}

function banner_left(){
	clearInterval(banner_interval);
	banner_interval=setInterval("leftmove()",30);
}

function banner_right(){
	clearInterval(banner_interval);
	banner_interval=setInterval("rightmove()",30);
}

function leftmove(){
	if (parseInt(blockArea.style.left)>(banner_width*(-1)+banner_term)){
		blockArea.style.left=parseInt(blockArea.style.left)-speed_obj+'px';;
	}
	else
		blockArea.style.left=parseInt(noneArea.style.left)+(banner_width+banner_term)+'px';

	if (parseInt(noneArea.style.left)>(banner_width*(-1)))
		noneArea.style.left=parseInt(noneArea.style.left)-speed_obj+'px';
	else
		noneArea.style.left=parseInt(blockArea.style.left)+(banner_width+banner_term)+'px';
}

function rightmove(){
	if (parseInt(blockArea.style.left)<(banner_width*(1)+banner_term)){
		blockArea.style.left=parseInt(blockArea.style.left)+speed_obj+'px';
	}
	else{
		blockArea.style.left=parseInt(noneArea.style.left)-(banner_width+banner_term)+'px';
	}

	if (parseInt(noneArea.style.left)<(banner_width*(1)+banner_term))
		noneArea.style.left=parseInt(noneArea.style.left)+speed_obj+'px';
	else
		noneArea.style.left=parseInt(blockArea.style.left)-(banner_width+banner_term)+'px';
}

function banner_stop(){
	speed_obj=0;
}

function banner_start(){
	speed_obj=banner_speed;
}