// javascript document
//燃气公司  通用js
$(function(){
	var ifie_lower, ifie_7, ifie_6;

	if(navigator.useragent.indexof("msie 6.0") > 0||navigator.useragent.indexof("msie 7.0") > 0||navigator.useragent.indexof("msie 8.0") > 0){
		ifie_lower = true;
	}
	if(navigator.useragent.indexof("msie 7.0") > 0){
		ifie_7 = true;
	}
	if(navigator.useragent.indexof("msie 6.0") > 0){
		ifie_6 = true;
	}
	//导航
	var doc = document;
	var onav = doc.getelementbyid("nav"),
		anav = onav.getelementsbytagname("li"),
		onav_width = 0;

	for(var i=0;i<anav.length;i++){
		onav_width += anav[i].offsetwidth;
	}

	onav.style.width = onav_width + "px";

	//二级菜单
	var navlower = $(".nav_lower")

	for(var i=0;i<navlower.length;i++){
		var nl_list = navlower[i].children;
		var nl_width = 0;
		
		for(var j=0;j<nl_list.length;j++){
			nl_width += nl_list[j].offsetwidth;
		}

		navlower[i].style.width = nl_width + "px";
		navlower[i].style.display = "none";
		navlower[i].style.left = -nl_width/2 + 50 + "px";
	}

	$("#nav li").mouseenter(function(){
		$(this).find(".nav_lower").stop(true,true).fadein()
	})
	$("#nav li").mouseleave(function(){
		$(this).find(".nav_lower").stop(true,true).fadeout()
	})
	//左侧导航
	var scrolltop;
	$(window).scroll(function(){

		scrolltop = document.documentelement.scrolltop || window.pageyoffset || document.body.scrolltop;
		var slide = document.getelementbyid("slide")
		if(slide){
			if(!ifie_6){
				if(scrolltop>=290){
					slide.style.position = "fixed";
					slide.style.top = "100px";
				}else{
					slide.style.position = "";
				}
			}else{
				if(scrolltop>=290){
					slide.style.position = "absolute";
					slide.style.top = scrolltop-290 + "px";
				}else{
					slide.style.position = "";
				}
			}
		}
	})

	var mark = $("<span><img src=\"images/slidenav.png\"></span>")   //有下级导航的情况下添加一个标识

	$(".slidenav_lower").prev().append(mark);

	$(".slidenavlink").click(function(){
		if($(this).next().is(":visible")){
			$(this).next().slideup()
		}else{
			$(this).next().slidedown()
		}
	})

})

//图片轮播
function rollimg(box,target,speed,clrori,clrcur){
	var count=$("."+box+" li").length;

	$("."+box+" li:not(:first-child)").hide()
	$("."+target+" a:first").css('background',clrcur)
	
	var timer;
	timer = setinterval(showauto,speed)

	function showauto(){

		var inum = $("."+box+" li").filter(":visible").index();

		if(inum==count-1)
		{
			inum = 0;
		}else{
			inum++;
		}
		$("."+target+" a").eq(inum).css('background',clrcur).siblings().css('background',clrori);
		$("."+box+" li").eq(inum).fadein().siblings().fadeout();	
	}

	$("."+target+" a").click(function(){
		inum = $(this).index();
		$(this).css('background',clrcur).siblings().css('background',clrori);
		$("."+box+" li").eq(inum).fadein().siblings().fadeout();
	})

	$("."+box).mouseenter(function(){

		clearinterval(timer)

	})

	$("."+box).mouseleave(function(){

		timer = setinterval(showauto,speed)

	})
}


// javascript document
//  加入收藏 <a onclick="addfavorite(window.location,document.title)">加入收藏</a>

function addfavorite(surl, stitle) {
    try {
        window.external.addfavorite(surl, stitle);
    }
    catch (e) {
        try {
            window.sidebar.addpanel(stitle, surl, "");
        }
        catch (e) {
            alert("加入收藏失败，请使用ctrl+d进行添加");
        }
    }
}
//设为首页 <a onclick="sethome(this,window.location)">设为首页</a>
function sethome(obj, vrl) {
    try {
        obj.style.behavior = 'url(#default#homepage)'; obj.sethomepage(vrl);
    }
    catch (e) {
        if (window.netscape) {
            try {
                netscape.security.privilegemanager.enableprivilege("universalxpconnect");
            }
            catch (e) {
                alert("此操作被浏览器拒绝！\n请在浏览器地址栏输入“about:config”并回车\n然后将 [signed.applets.codebase_principal_support]的值设置为'true',双击即可。");
            }
            var prefs = components.classes['@mozilla.org/preferences-service;1'].getservice(components.interfaces.nsiprefbranch);
            prefs.setcharpref('browser.startup.homepage', vrl);
        }
    }
}