function displaySubMenu(li) {
		var subMenu = li.getElementsByTagName("ul")[0];
		subMenu.style.display = "block";
	}
	function hideSubMenu(li) {
		var subMenu = li.getElementsByTagName("ul")[0];
		subMenu.style.display = "none";
	}
	function selectTag(showContent,selfObj){
								// 操作标签
								var tag = document.getElementById("hot-nav").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";
							}
	function selectTagcar(showContent,selfObj){
								// 操作标签
								var tag = document.getElementById("car-nav").getElementsByTagName("li");
								var taglength = tag.length;
								for(i=0; i<taglength; i++){
									tag[i].className = "";
								}
								selfObj.parentNode.className = "selectTagcar";
								// 操作内容
								for(i=0; j=document.getElementById("carContent"+i); i++){
									j.style.display = "none";
								}
								document.getElementById(showContent).style.display = "block";
							}