<script language="JavaScript">
        function showLDiv()
        {
        if(  document.getElementById("loginDiv").style.display == 'none' )
             document.getElementById("loginDiv").style.display = ''
        else document.getElementById("loginDiv").style.display = 'none'

        return false;
        }
        function check_form()
        {
        if(document.forms["form_login"].req_username.value=='' || document.forms["form_login"].req_username.value=='') {
        alert('Еще рано нажимать на "Войти"');
        return false;
        }
        return true
        }
        url=document.URL
        if(url.indexOf("login.php")==-1  && document.getElementById('navlogin')){
        document.getElementById('navlogin').innerHTML  = "<a href=\"login.php\" onclick=\"return showLDiv()\"><span>Войти</span></a>"
        login = "<centr><div id=loginDiv style=\"display: none; \">"

        login += "<form id=form_login name=login method=post action=\"login.php?action=in\" onsubmit=\"return check_form()\">"
        login += "<fieldset>"
        login += "<legend>Введите свое имя и пароль</legend>"
        login += "<input type=hidden name=form_sent value=1 />"
        login = login + "<input type=hidden name=redirect_url value="+document.URL+" />"
        login += "<br><table width=\"100%\" align=centr>"
        login += "<tr><td align=left><b>Имя :</b></td><td align=left><input type=\"text\" id=\"fld1\" name=\"req_username\" size=\"21\" maxlength=\"25\" /></td></tr>"
        login += "<tr><td align=left><b>Пароль :</b></td><td align=left><input type=\"password\" id=\"fld2\" name=\"req_password\" size=\"7\" maxlength=\"16\" /><span class=formsubmit><input type=submit class=button name=login value=\"Войти\" /></span>"
        login += "</form></td></tr>"
        login += "</table>"
        login += "</fieldset>"
        login += "<p><a href=\"register.php\">  Зарегистрироваться.</a>                                                         <a href=\"login.php?action=forget\">   Забыли пароль?</a></p>"   
    login += "</div></center>"

        document.getElementById('pun-navlinks').innerHTML += login
        }
        </script>
        <style>
        #loginDiv{
            position:absolute;
            z-index: 2;
            background-color : #BEBEBE;
            border : solid;
            padding-bottom : 10px;
            padding-left : 0px;
            padding-right : 0px;
            padding-top : 5px;
            width: 290px;
        }
        </style>