function paskujtabelki() {
	tabelki = document.getElementsByTagName('table');
	for(i = 0; i < tabelki.length; i++) {
		tabelka = tabelki[i];
		wiersze = tabelka.getElementsByTagName('tr');
		for (j=0; j<wiersze.length; j++) {
			wiersz = wiersze[j];
			if (j%2) wiersz.style.backgroundColor = '#f5f5f5';
		}
	}
}


if(window.addEventListener) {
	window.addEventListener("load",paskujtabelki,false);
} else if(window.attachEvent) {
	window.attachEvent("onload",paskujtabelki);
} else if(window.onload) {
	var staryonload = window.onload;
	window.onload = function onloadzestarym() {
			staryonload();
			paskujtabelki();
		};
} else {
	window.onload = paskujtabelki;
}