function selectTag(showContent,selfObj){ 
	// tab
	var tag = document.getElementById("label").getElementsByTagName("li"); 
	var taglength = tag.length; 
	for(i=0; i<taglength; i++){ 
	tag[i].className = ""; 
	} 
	selfObj.parentNode.className = "now"; 
	
	// content 
	for(i=0; j=document.getElementById("tagContent"+i); i++){ 
	j.style.display = "none"; 
	} 
	document.getElementById(showContent).style.display = "block"; 
}