function $(id) {
	return document.getElementById(id);
}

function changeTab(o, tabs_name, tab_num) {
	var sections = o.parentNode.parentNode.getElementsByTagName('DIV');
	// Reset tabs ...
	var tabs_count = sections.length;
	for (i = 0; i < tabs_count; i++) {
		sections[i].className = 'tab_link';
	}
	// Hide content ...
	for (i = 1; i <= tabs_count; i++) {
		$(tabs_name + i).style.display = 'none';
	}
	// Open choosen tabs ...
	o.parentNode.className = 'tab_active';
	$(tabs_name + tab_num).style.display = 'block';
	tabname = tabs_name + tab_num;
	return false;
}