function $(id) {
	return document.getElementById(id);
}
function set_value(id,tekst) {
	if ($(id).value=='') {
		$(id).value=tekst;
	}
}
function clear_value(id,tekst) {
	if ($(id).value==tekst) {
		$(id).value='';
	}
}
function putcookie(c_name,value,expiredays) {
    var exdate=new Date();
    exdate.setDate(exdate.getDate()+expiredays);
    document.cookie = c_name + "=" + escape(value) + ((expiredays==null) ? "" : ";expires="+exdate);
}
function getcookie(c_name) {
    if(document.cookie.length > 0) {
        var c_start = document.cookie.indexOf(c_name + "=");
        if(c_start != -1) {
            c_start = c_start + c_name.length + 1;
            var c_end = document.cookie.indexOf(";",c_start);
            if(c_end == -1)
                c_end = document.cookie.length;
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    return null;
}
var ID_news;
function show_n_layer(layer) {
	if (getcookie('aktual_news')==null) {
		layer_old='div_n_1';
	} else {
		layer_old=getcookie('aktual_news');
	}
	putcookie('aktual_news', layer, 7200);
	$(layer_old).style.display='none';
	$(layer).style.display='block';
	clearInterval(ID_news);
	ID_news=setInterval("auto_ch_layers("+getcookie('max_news')+")",5000);
}
function auto_ch_layers (max) {
	var index=0;
	if (getcookie('aktual_news')==null) {
		layer_old='div_n_1';
	} else {
		layer_old=getcookie('aktual_news');
	}
	index=parseInt(layer_old.substr(6));
	if (max>index) {
		// kolejna warstwa
		new_layer="div_n_"+(index+1);
	} else {
		// zaczynamy od poczatku
		new_layer='div_n_1';
	}
	$(layer_old).style.display='none';
	$(new_layer).style.display='block';
	putcookie('aktual_news', new_layer, 7200);
}
function galeria(numer) {
	window.open('/foto,f'+numer+'.html','powiekszenie','width=800,height=720,status=yes,resizable=no,menubar=no,scrollbars=no');
}
function drukuj(numer) {
	window.open('drukuj_art.php?id_art='+numer,'artykul','width=800,height=600,scrollbars=yes,menubar=no,statusbar=no,resizable=yes');
	}