function alert(str, caption) {    this.disappear = function () {        $("#bgdiv").remove();        $("#msgdiv").remove();        $("#msgtitle").remove();        msgobj = null;        msgdiv = null;    };    disappear();    this.m_text = str;    this.m_caption = caption;    this.m_width = 200;    this.m_height = 100;    this.m_wait = 1000;    this.m_fade = 500;    this.m_bordercolor = "#336699";    this.m_titlecolor = "#99ccff";    var msgw, msgh, bordercolor;    msgw = m_width; //提示窗口的宽度    msgh = m_height; //提示窗口的高度    titleheight = 25 //提示窗口标题高度    bordercolor = m_bordercolor; //提示窗口的边框颜色    titlecolor = m_titlecolor; //提示窗口的标题颜色    var swidth, sheight;    swidth = document.body.offsetWidth;    sheight = document.body.offsetHeight;    if (sheight < screen.height) {        sheight = screen.height;    }    // //此处可以添加一个背景，防止多次点击保存按钮    // if(bgobj==undefined){
        // var bgobj=document.createElement("div");    // }    // bgobj.setAttribute('id','bgdiv');    // bgobj.style.position="absolute";    // bgobj.style.top="0";    // bgobj.style.background="#777";    // bgobj.style.filter="progid:dximagetransform.microsoft.alpha(style=3,opacity=25,finishopacity=75";    // bgobj.style.opacity="0.6";    // bgobj.style.left="0";    // bgobj.style.width=swidth + "px";    // bgobj.style.height=sheight + "px";    // bgobj.style.zindex = "10000";    // document.body.appendChild(bgobj);    if (msgobj == null) {        var msgobj = document.createElement("div");    }    msgobj.setAttribute("id", "msgdiv");    msgobj.setAttribute("align", "center");    msgobj.style.background = "white";    msgobj.style.border = "1px solid " + bordercolor;    msgobj.style.position = "absolute";    msgobj.style.left = "50%";    msgobj.style.top = "50%";    msgobj.style.font = "12px/1.6em verdana, geneva, arial, helvetica, sans-serif";    msgobj.style.marginLeft = "-115px";    msgobj.style.marginTop = -115 + document.documentElement.scrollTop + "px";    msgobj.style.width = msgw + "px";    msgobj.style.height = msgh + "px";    msgobj.style.textAlign = "center";    msgobj.style.lineHeight = (msgh - titleheight) + "px";    msgobj.style.zIndex = "10001";    if (title == null) {        var title = document.createElement("h4");    }    title.setAttribute("id", "msgtitle");    title.setAttribute("align", "left");    title.style.margin = "0";    title.style.padding = "3px";    title.style.background = bordercolor;    title.style.filter = "progid:dximagetransform.microsoft.alpha(startx=20, starty=20, finishx=100, finishy=100,style=1,opacity=75,finishopacity=100);";    title.style.opacity = "0.75";    title.style.border = "1px solid " + bordercolor;    title.style.height = "18px";    title.style.font = "12px verdana, geneva, arial, helvetica, sans-serif";    title.style.color = "white";    title.style.cursor = "pointer";    title.innerHTML = "消息提示";    title.onclick = function () {        disappear();    }    document.body.appendChild(msgobj);    document.getElementById("msgdiv").appendChild(title);    var txt = document.createElement("p");    txt.style.margin = "1em 0"    txt.setAttribute("id", "msgtxt");    txt.innerHTML = str;    document.getElementById("msgdiv").appendChild(txt);    this.fadeout = function () {        $("#bgdiv").fadeOut(1000);        $("#msgdiv").fadeOut(1000);        $("#msgtitle").fadeOut(1000, function () { disappear() });    }    setTimeout("fadeout()", 500);};