function changeNew(obj) {
   if (obj==0) {
	document.getElementById('news0').style.display="";
	document.getElementById('0').className = "mainMiddleBTS";
	document.getElementById('news1').style.display="none";
	document.getElementById('1').className = "mainMiddleBT";
	document.getElementById('news2').style.display="none";
	document.getElementById('2').className = "mainMiddleBT";	
	document.getElementById('news3').style.display="none";
	document.getElementById('3').className = "mainMiddleBT";
	
   }else if (obj == 1) {
	document.getElementById('news0').style.display="none";
	document.getElementById('0').className = "mainMiddleBT";
	document.getElementById('news1').style.display="";
	document.getElementById('1').className = "mainMiddleBTS";
	document.getElementById('news2').style.display="none";
	document.getElementById('2').className = "mainMiddleBT";	
	document.getElementById('news3').style.display="none";
	document.getElementById('3').className = "mainMiddleBT";
   }else if (obj == 2) {
	document.getElementById('news0').style.display="none";
	document.getElementById('0').className = "mainMiddleBT";
	document.getElementById('news1').style.display="none";
	document.getElementById('1').className = "mainMiddleBT";
	document.getElementById('news2').style.display="";
	document.getElementById('2').className = "mainMiddleBTS";	
	document.getElementById('news3').style.display="none";
	document.getElementById('3').className = "mainMiddleBT";
   }else if (obj == 3) {
	document.getElementById('news0').style.display="none";
	document.getElementById('0').className = "mainMiddleBT";
	document.getElementById('news1').style.display="none";
	document.getElementById('1').className = "mainMiddleBT";
	document.getElementById('news2').style.display="none";
	document.getElementById('2').className = "mainMiddleBT";	
	document.getElementById('news3').style.display="";
	document.getElementById('3').className = "mainMiddleBTS";
   }
}