var docElement = function() {
return document.getElementById(arguments[0]) || false;
}

function hideWindow(_id)
{
	document.body.removeChild(docElement(_id));
	document.body.removeChild(docElement("window_mask"));
}

function showWindow(_id) {
var m = "window_mask";
if (docElement(_id)) document.removeChild(docElement(_id));
if (docElement(m)) document.removeChild(docElement(m));

if(_id == 'login')
{
  content = "<div class=\"window_title\"><div class=\"wt_notice\">登陆</div><div align=\"right\"><a href=\"#\" class=\"close_button\" onclick=\"hideWindow('login');return false;\" title=\"关闭\">×</a></div></div>"+
  "<div class=\"window_r\"><div class=\"window_lable\">用户名:</div><div class=\"window_field\"><input type=\"text\" class=\"win_text\" name=\"user_name\"></div></div>"+
"<div class=\"window_r\"><div class=\"window_lable\">密&nbsp;&nbsp;码:</div><div class=\"window_field\"><input type=\"password\" class=\"win_text\" name=\"user_pwd\"></div></div>"+
  "<div class=\"window_btn\"><input type=\"button\" class=\"win_btn\" name=\"login\" value=\"登陆\" onclick=\"login()\">&nbsp;&nbsp;&nbsp;&nbsp;<a href=\"#\" onClick=\"forget();return false;\">忘记密码</a></div>"+
  "<div class=\"window_btn\"> 没有帐号？<a href=\"#\" onclick=\"hideWindow('login');showWindow('regist');return false;\">我要注册</a></div>";
}
if(_id == 'regist')
{
  content = "<div class=\"window_title\"><div class=\"wt_notice\">注册</div><div align=\"right\"><a href=\"#\" class=\"close_button\" onclick=\"hideWindow('regist');return false;\" title=\"关闭\">×</a></div></div>"+
  "<div class=\"window_r\"><div class=\"window_lable\">用&nbsp;户&nbsp;名:</div><div class=\"window_field\"><input type=\"text\" class=\"win_text\" name=\"user_name\" onchange=\"check_name(this.value)\"><span id=\"check_names\"></span></div></div><div class=\"window_r\"><div class=\"window_lable\">密&nbsp;&nbsp;&nbsp;&nbsp;码:</div><div class=\"window_field\"><input type=\"password\"  class=\"win_text\" name=\"user_pwd\"></div></div>"+
  "<div class=\"window_r\"><div class=\"window_lable\">确认密码:</div><div class=\"window_field\"><input type=\"password\"  class=\"win_text\" name=\"user_repwd\"></div></div><div class=\"window_r\"><div class=\"window_lable\">验&nbsp;证&nbsp;码:</div><input type=\"text\" class=\"win_text\" name=\"identify\"><img src=\"./imagecode.php\" title=\"看不清楚，换一张\"  style=\"cursor: pointer;\" onclick=\"newgdcode(this,this.src);\" /></div></div>"+
  "<div class=\"window_btn\"><input type=\"button\" id=\"logins\" class=\"win_btn\" name=\"login\" value=\"注册\">&nbsp;&nbsp;&nbsp;&nbsp;<a href=\"#\" onClick=\"forget();return false;\">忘记密码</a></div>"+
  "<div class=\"window_btn\">已有帐号？<a href=\"#\" onclick=\"hideWindow('regist');showWindow('login');return false;\">我要登陆</a></div>";
}
// 新激活图层
var _div = document.createElement("div");
_div.id = _id;
_div.style.left = (parseInt(document.body.scrollWidth) - 300) / 2 + "px"; // 屏幕居中
_div.innerHTML = content;
document.body.appendChild(_div);
$("input[name='user_name']").focus();


// mask图层
var _Mask = document.createElement("div");
_Mask.id = m;
_Mask.style.display="block";

var de=document.documentElement;
de.style.overflow="hidden";
_Mask.style.width=de.clientWidth+"px";
_Mask.style.height=de.clientHeight+"px";
de.style.overflow="auto";

document.body.appendChild(_Mask);
}