// JavaScript Document
var totalTab = 3;
var posTab = 1;
var time = 7.0; //secord time
var timer;

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

function setTime(){ 
	timer = setTimeout("calPos()",time * 1000); 
}

function clearTime(){ 
	clearTimeout(timer);
}

function chTab(val){

	if(val != ""){	
		var i = 1;
		while(i <= totalTab){		
			$("lyTab"+i).style.display="none";	
			$("tdTab"+i).className="tab-out"+i;
			i++;
		}
		
		$("lyTab"+val).style.display="block";
		$("tdTab"+val).className="tab-over"+val;	
		posTab = val;
		//clearTime();
//		setTime();
	} else {
		return false;
	}
}

function calPos(){

	if(posTab >= totalTab) {
		posTab = 1;
	} else {
		posTab += 1; 		
	}
	showDIV(posTab);
	setTime();
}


function showDIV(div_id) 
{
	if(div_id==1)
	{
		document.getElementById('news_2').style.display = 'none';
		document.getElementById('news_3').style.display = 'none';
		document.getElementById('news_1').style.display = 'block';
	}
	else if(div_id==2)
	{
		document.getElementById('news_1').style.display = 'none';
		document.getElementById('news_3').style.display = 'none';
		document.getElementById('news_2').style.display = 'block';
	}
	else if(div_id==3)
	{
		document.getElementById('news_1').style.display = 'none';
		document.getElementById('news_2').style.display = 'none';
		document.getElementById('news_3').style.display = 'block';
	}



}