function findInPage(str) {    var txt, i, found;    if (str == "") return false;    if (DOM) {        win.find(str, false, true);        return true;    }    if (NS4) {        if (!win.find(str)) while (win.find(str, false, true)) n++;        else n++;        if (n == 0) alert("未找到指定内容.");    }    if (IE4) {        txt = win.document.body.createTextRange();        for (i = 0; i <= n && (found = txt.findText(str)) != false; i++) {            txt.moveStart("character", 1);            txt.moveEnd("textedit");        }        if (found) {            txt.moveStart("character", -1);            txt.findText(str);            txt.select();            txt.scrollIntoView();            n++;        } else {            if (n > 0) {                n = 0;                findInPage(str);            } else alert("未找到指定内容.");        }    }    return false;}