function switch_tab(tab_object){
	var tab_object = tab_object;
	var content_object = document.getElementById(tab_object.id+"-content");
	var parent_object = document.getElementById(tab_object.parentNode.id);
	var tabs = parent_object.getElementsByTagName("li");
	for (var i = 0; i < tabs.length; i++) {
		var thisTab = tabs[i];
		if (thisTab.id) {
			var other_content_object = document.getElementById(thisTab.id+"-content");
			other_content_object.style.display = 'none';
			var other_tab_object = document.getElementById(thisTab.id);
			other_tab_object.className = null;	
		}
	}	
	tab_object.className = "selected";	
	content_object.style.display = 'block';
}