function popup(URL,w,h) {

    if (window.screen) {
        screen_w = screen.availWidth;
        screen_h = screen.availHeight;
    } else {
        screen_w=800;
        screen_h=600;
    }
    params="width="+w+",height="+h+",left="
    +(screen_w-w)/2+",top="
    +(screen_h-h)/2
    +",toolbar=no,location=0,directories=no,"
    +"status=no,menubar=no,"
    +"scrollbars=no,resizable=no";
    window.open(URL,'popup',params);
}
//zmienia img w popupie dar natury
function changeImage (src) {
    var ending = src.slice(-5);
    ending = ending.slice(0,1);
    if (ending == 6){
        ending = 1;
    }else {
        ending++;
    }
    var address = '../img/design_is_fun/dar_natury/slide'+ending+'.jpg';
    document.images['popup_img'].src = address;
}

function show_color_bg() {

    var cookieName = "visitor";
    //czy istnieja jakiekolwiek cookies
    if (document.cookie.length>0){
        //znajdz cookie visitor
        c_start = document.cookie.indexOf(cookieName + "=");
        //jesli go nie ma to
        if (c_start == -1) {
            //utworz cookie visitor
            var exdate=new Date();
            exdate.setDate(exdate.getDate()+ 1);
            document.cookie='visitor=1;expires=' + (exdate.toGMTString());

            //zmien wyglad strony

            logowanie_form = document.getElementById('logowanie');
            logowanie_form.className = 'onlogin';
        }
   
    }
 
}
     function mailMe(idx) {
	var chars = ['e','f','i','k','n', 'o', 's','.','@'];
	var mail = '';
	for (i=0 ; i<idx.length; i++)
		mail += chars[idx[i]];

	location.href='mailto:' + mail;
	return false;
      }

function WyslijMail(B) {
    if (B != '') {
        var A = 'mailto:';
        var C = '%40';
        var Domena = 'gmail.com';
        document.location = [A]+[B]+[C]+[Domena];
        return false;
    }
}