window.onload = boxAlign;
window.onresize = boxAlign;

function boxAlign(){
	var box = document.getElementById('newsBox');
	var boxw = box.offsetWidth - 21;	
	var tabw = Math.floor( boxw / 5 );
	
	document.getElementById('tab1').style.width = tabw + 'px';
	document.getElementById('tab2').style.width = tabw + 'px';
	document.getElementById('tab3').style.width = tabw + 'px';
	document.getElementById('tab4').style.width = tabw + 'px';
	document.getElementById('tab5').style.width = tabw + 'px';
}