function	display_tab(elem) {
	
	var active = document.getElementById("tab-active");
	
	var equ = (elem.parentNode.getAttribute("id") == 'tab-active');
	
	
	if (active)
	
		active.removeAttribute("id");
	
	
	if (!equ)

		elem.parentNode.setAttribute("id", "tab-active");
	

	
	return true;

}