lang_pl = new Image(); lang_pl.src = "templates/img/lang_pl.gif";
lang_pl2 = new Image(); lang_pl2.src = "templates/img/lang_pl2.gif";

lang_en = new Image(); lang_en.src = "templates/img/lang_en.gif";
lang_en2 = new Image(); lang_en2.src = "templates/img/lang_en2.gif";

firma = new Image(); firma.src = "templates/img/firma.gif";
firma2 = new Image(); firma2.src = "templates/img/firma2.gif";

oferta = new Image(); oferta.src = "templates/img/oferta.gif";
oferta2 = new Image(); oferta2.src = "templates/img/oferta2.gif";

portfolio = new Image(); portfolio.src = "templates/img/portfolio.gif";
portfolio2 = new Image(); portfolio2.src = "templates/img/portfolio2.gif";

kontakt = new Image(); kontakt.src = "templates/img/kontakt.gif";
kontakt2 = new Image(); kontakt2.src = "templates/img/kontakt2.gif";



firma_en = new Image(); firma_en.src = "templates/img/firma_en.gif";
firma2_en = new Image(); firma2_en.src = "templates/img/firma2_en.gif";

oferta_en = new Image(); oferta_en.src = "templates/img/oferta_en.gif";
oferta2_en = new Image(); oferta2_en.src = "templates/img/oferta2_en.gif";


kontakt_en = new Image(); kontakt_en.src = "templates/img/kontakt_en.gif";
kontakt2_en = new Image(); kontakt2_en.src = "templates/img/kontakt2_en.gif";

<!-- repeat the lines above for any subsequent images. -->

function swap()
{
	if (document.images)
	{
		for (var x=0;
		x<swap.arguments.length;
		x+=2) 
		{
			document[swap.arguments[x]].src = eval(swap.arguments[x+1] + ".src");
		}
	}
}