if (navigator.appName=="Netscape") {
	document.write("<style type='text/css'>body {overflow-y:scroll;}<\/style>");
}
var userAgent = navigator.userAgent.toLowerCase();
var is_ie = (userAgent.indexOf('msie') != -1) && userAgent.substr(userAgent.indexOf('msie') + 5, 3);

function $() {
	var elements = new Array();
	for (var i = 0; i < arguments.length; i++) {
		var element = arguments[i];
		if (typeof element == 'string')
			element = document.getElementById(element);
		if (arguments.length == 1)
			return element;
		elements.push(element);
	}
	return elements;
}

function Scale(image, max_width, max_height) {
	var tempimage = new Image();
	tempimage.src = image.src;
	var tempwidth = tempimage.width;
	var tempheight = tempimage.height;
	if (tempwidth > max_width) {
		image.height = tempheight = Math.round(((max_width)/tempwidth) * tempheight);
		image.width = tempwidth = max_width;
	}

	if (max_height != 0 && tempheight > max_height)
	{
		image.width = Math.round(((max_height)/tempheight) * tempwidth);
		image.height = max_height;
	}
}

function check_avatar(image, langfolder){
	var tempimage = new Image();
	tempimage.src = image.src;
	var displayheight = image.height;
	var tempwidth = tempimage.width;
	var tempheight = tempimage.height;
	if (tempwidth > 250 || tempheight > 250 || displayheight > 250) {
		image.src='pic/forum_pic/'+langfolder+'/avatartoobig.png';
	}
}

function Preview(image) {
	if (!is_ie || is_ie >= 7){
	$('lightbox').innerHTML = "<a onclick=\"Return();\"><img src=\"" + image.src + "\" /></a>";
	$('curtain').style.display = "block";
	$('lightbox').style.display = "block";
	}
	else{
	window.open(image.src);
	}
}

function Previewurl(url) {
	if (!is_ie || is_ie >= 7){
	$('lightbox').innerHTML = "<a onclick=\"Return();\"><img src=\"" + url + "\" /></a>";
	$('curtain').style.display = "block";
	$('lightbox').style.display = "block";
	}
	else{
	window.open(url);
	}
}

function findPosition( oElement ) {
  if( typeof( oElement.offsetParent ) != 'undefined' ) {
    for( var posX = 0, posY = 0; oElement; oElement = oElement.offsetParent ) {
      posX += oElement.offsetLeft;
      posY += oElement.offsetTop;
    }
    return [ posX, posY ];
  } else {
    return [ oElement.x, oElement.y ];
  }
}

function Return() {
	$('lightbox').style.display = "none";
	$('curtain').style.display = "none";
	$('lightbox').innerHTML = "";
}
// 处理图片加载失败的函数
function handleImageError(img, currentSrc) {
    if (!currentSrc.includes('doubanio.com')) {
        return;
    }
    const domainList = ['img1.doubanio.com', 'img2.doubanio.com', 'img3.doubanio.com', 'img9.doubanio.com']; // 备用域名列表
    let index = 0;
    function tryNextDomain() {
        if (index >= domainList.length) {
            return;
        }
        img.src = currentSrc.replace(/https:\/\/[a-zA-Z0-9.-]+\.doubanio\.com/, `https://${domainList[index]}`);
        img.onload = () => {
            img.onload = img.onerror = null;
        };
        img.onerror = tryNextDomain;
    }
    tryNextDomain();
}
