var tabs = new Array('tab1', 'tab2');
function activateTab(tab) {
	for (i = 0; i < tabs.length; i++) {
		if (document.getElementById(tabs[i])) {
			document.getElementById(tabs[i]).style.display = 'none';
			document.getElementById(tabs[i] + '1').style.background = "url('./images/background_zakladki.gif')"; 
			document.getElementById(tabs[i] + '2').style.color = '#000000';
		} 
	}
	document.getElementById(tab).style.display = 'block';
	document.getElementById(tab + '1').style.background ='#4d78cb';
	document.getElementById(tab + '2').style.color = '#ffffff';
}