var ie=document.all;
var dom=document.getElementById;
var ns4=document.layers;
var crossobj=null;
var speedPopup = 1500;
var timeOutPopup = 100;
var scroll_top = 0;

function initbox(){
    if (!dom&&!ie&&!ns4) return;
    
    crossobj = $("#popupBox");
    scroll_top = (ie)? truebody().scrollTop : window.pageYOffset;
    deltaPx = $(window).height()/2;
    if(scroll_top > 0){
        crossobj.css({top: scroll_top - crossobj.height()});
    }               
    scroll_top = scroll_top+deltaPx-crossobj.height()/2;
    crossobj.show().animate({
        top: scroll_top+'px'
    }, speedPopup);
}

function truebody(){
    return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function get_cookie(Name) {
    //return false;
    var search = Name + "="
    var returnvalue = ""
    if (document.cookie.length > 0) {
        offset = document.cookie.indexOf(search)
        if (offset != -1) {
            offset += search.length
            end = document.cookie.indexOf(";", offset)
            if (end == -1)
            end = document.cookie.length;
            returnvalue=unescape(document.cookie.substring(offset, end))
        }
    }
    return returnvalue;
}

function dropornot(){
    if (get_cookie("droppedin")=="")
    {
        window.onload = function()
        {
            setTimeout('initbox()', timeOutPopup); 
            document.cookie="droppedin=yes"      
        }
    }
}

<!--
function MM_preloadImages() { //v3.0
var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
//-->

$(document).ready(function(){
    
    dropornot();
    MM_preloadImages('images/whiteBg.png', 'images/close.png', 'images/buttonSub.png');
    
    //Вывод сообщений по ошибкам ajax
    $('body').ajaxError(function(event, request, settings){ 
            alert("Ошибка запроса! Обновите страницу или попробуйте позже.");                           
    });
    
    function curtain_show(){
        $("#ajaxloaderImg").show();                
    }
    
    function curtain_hide(){
        $("#ajaxloaderImg").hide();        
    }
    
    $("body").ajaxStop(function(){
        curtain_hide();
    });
    
    var data = {};
    var ent_name = 'Введите свое имя';
    var ent_email = 'Введите свой E-mail';
    $('#field_name_first').val(ent_name);
    $('#field_email').val(ent_email);
    
    $('#field_name_first').focus(function(){
        if($(this).val() == ent_name) $(this).val('');
    });
    
    $('#field_email').focus(function(){
        if($(this).val() == ent_email) $(this).val('');
    });
    
    $('#field_name_first').blur(function(){
        if($(this).val() == '') $(this).val(ent_name);
    });
    
    $('#field_email').blur(function(){
        if($(this).val() == '') $(this).val(ent_email);
    });
        
    $('#popupClose a').click(function(){
        $('#popupBox').slideUp(500);
    });
      
        
});