function G(id){return document.getElementById(id);}
function changeTab(tabUL, n, cntID){
	var ul = G(tabUL);
	var lis = ul.getElementsByTagName('li');
	for(var i=0; i<lis.length; i++){
		lis[i].className = lis[i].className.replace(/\s*focus/, '');
		G(cntID + '_' + i).style.display = 'none';
	}
	lis[n].className = lis[n].className ? lis[n].className + ' focus' : 'focus';
	G(cntID + '_' + n).style.display = '';
}
/*function showMoreIntroButton(){
    var introAll=G('intro');
	if(introAll.scrollHeight>170){
		G('introMore').style.display='block';
	}
}*/