function selectTag(showContent, selfObj) {
	// 操作标签
	var tag = document.getElementById("tags").getElementsByTagName("li");
	var taglength = tag.length;
	for (i = 0; i < taglength; i++) {
		tag[i].className = "";
	}
	selfObj.parentNode.className = "selectTag";
	// 操作内容
	for (i = 0; j = document.getElementById("tagContent" + i); i++) {
		j.style.display = "none";
	}
	document.getElementById(showContent).style.display = "block";
}