function kursorNaOd(buttonType, imgNaOd)
{
         var blok = document.getElementById(buttonType).style;
         blok.background = 'url(gfx/button_'+buttonType+'_'+imgNaOd+'.gif)';
}
var button_wyczysc_na = new Image();
button_wyczysc_na.src = "gfx/button_wyczysc_na.gif";
var button_wyczysc_nap = new Image();
button_wyczysc_nap.src = "gfx/button_wyczysc_nap.gif";
var button_ok_na = new Image();
button_ok_na.src = "gfx/button_ok_na.gif";
var button_ok_nap = new Image();
button_ok_nap.src = "gfx/button_ok_nap.gif";