function show_big(img_b,kat,szer_big,wys_big){
if (window.win_big)
         window.win_big.close();
win_big = window.open("./content.php?page=show_big&img_b="+img_b+"&kat="+kat+"&szer_big="+szer_big+"&wys_big="+wys_big,"win_big","width=530,height=410,scrollbars=no,defaultstatus=no,menubar=no,statusbar=no,locationbar=no,status=no,resizable=yes,top="+130+",left="+250);
}