var myimages = new Array();
function preloading(){
for (x=0; x<preloading.arguments.length; x++){
myimages[x] = new Image();
myimages[x].src = preloading.arguments[x];
}
}
preloading("images/btn_ofirmie_over.jpg", "images/btn_oferta_over.jpg", "images/btn_kontakt_over.jpg", "images/btn_linki_over.jpg");