/**
 * 给导航添加active样式
 * @param id
 */
function setActiveNav(id) {
	if (id == 0) {
		$('li.eap_nav_a').find('a').addClass('active');
	} else if (id > 0 && id < 6) {
		$('li.eap_nav_b').eq(id - 1).find('a').addClass('active');
	} else if (id == 6) {
		$('li.eap_nav_c').find('a').addClass('active');
	}
}
/**
 * 以下四个函数为头部搜索
 */
function serach_form_submit(){
	if(cksearch())
		$('#seach_form').submit();
}
function cls() {
	var val = document.getElementById("txtKey");
	if (val.value == val.defaultValue)
		val.value = "";
}
function res() {
	var val = document.getElementById("txtKey");
	if (val.value == "")
		val.value = val.defaultValue;
}
function cksearch() {
	var obj = document.getElementById("txtKey");
	if (obj.value == obj.defaultValue || obj.value == "") {
		alert("请输入关键词");
		return false;
	} else {
		return true;
	}
}
function backTop(btnId){
	var btn=document.getElementById(btnId);
	var d=document.documentElement;
	window.onscroll=set;
	btn.onclick=function (){
		btn.style.display="none";
		window.onscroll=null;
		this.timer=setInterval(function(){
			d.scrollTop-=Math.ceil(d.scrollTop*0.1);
			if(d.scrollTop==0) clearInterval(btn.timer,window.onscroll=set);
		},10);
	};
	function set(){btn.style.display=d.scrollTop?'block':"none"}
};