function stationaryNetPrint(szybk,umowa,abon,modem ) {
       href = 'http://www.sklep.era.pl/druk/index.php?sz=' + szybk + "&um=" + umowa + "&ab=" + abon + "&mo=" + modem;

       var scrWidth = 900; // szerokosc popup'u
       var scrHeight = 450; // wysokosc popup'u
       
       resizable = "yes"; // ustawia parametr resizable
       
       var adj = 10;
       var w = screen.width;
       var h = screen.height;

       if(w<740){
             var lift=0.90;
       }
       if(w>=740 & w<835){
             var lift=0.91;
       }
       if(w>=835){
             var lift=0.93;
       }

       var posLeft=0;
       var posTop=0;

       posTop              = ((h-(scrHeight/lift)-adj)/2);
       posLeft      = ((w-(scrWidth)-adj)/2);
       posTop              = parseInt(posTop);
       posLeft      = parseInt(posLeft);
       
       var w = window.open(href,'drukuj',"scrollbars=yes,status=yes,menubar=yes,toolbar=no,resizable="+resizable+",directories=0,height="+scrHeight+",width="+scrWidth+",left="+posLeft+",top="+posTop);
       w.focus();
       
       //return false;
}
function pokazUkryj(id){
    document.getElementById(id).style.display = (document.getElementById(id).style.display == "none") ? "block" : "none";
}