function getRef(elementId) {
	var ref;
	if (document.getElementById){ 
		/* Recent specific code */ 
		ref = document.getElementById(elementId); 
	} 
	else if (document.all){ 
		/* IE4+ specific code */ 
		ref = document.all[elementId];	
	} 
	else if (document.forms){ 
		/* Netscape 4 specific code */ 
		ref = document.forms[elementId]; 
	}
	return ref;
}

function show(elementId) {
	getRef(elementId).style.display = "";
}

function hide(elementId) {
	getRef(elementId).style.display = "none";
}

function hide_all() {
	hide('1_active');
	show('1_unactive');
	hide('2_active');
	show('2_unactive');
	hide('3_active');
	show('3_unactive');
	hide('4_active');
	show('4_unactive');
	hide('5_active');
	show('5_unactive');

	hide('1art_active');
	hide('2art_active');
	hide('3art_active');
	hide('4art_active');
	hide('5art_active');
}