function showTab(id) {
	var divTab = document.getElementById('tab_' + id);
	var aTabButton = document.getElementById('tab_button_' + id);
	
	if (divTab && aTabButton) {
		hideAllTabs();
		
		divTab.style.display = 'block';
		aTabButton.className = 'on';
	}
}

function hideTab(id) {
	var divTab = document.getElementById('tab_' + id);
	var aTabButton = document.getElementById('tab_button_' + id);
	
	if (divTab) {
		divTab.style.display = 'none';
		aTabButton.className = '';
	}
}

function hideAllTabs(id) {
	for (i = 0; i < arrTabs.length; i++) {
		hideTab(arrTabs[i]);
	}
}