// JavaScript Document
function selectTag(tag,num){
	// 操作标签
	var tagnav = tag+"Nav";
	var tagContent = tag+"Content";

	var tag = document.getElementById(tagnav).getElementsByTagName("li");
	var taglength = tag.length;
	for(i=0; i<taglength; i++){
		if(i+1==num){
			tag[i].className = "selectTag";
		}else{
			tag[i].className = "";
		}
	}
	// 操作内容
	var contents = document.getElementById(tagContent).getElementsByTagName("div");
	for(var i= 0;i<contents.length;i++){
		if(i+1==num){
			contents[i].style.display = "block";
		}else{
			contents[i].style.display = "none";
		}
	}

}