// JavaScript Document

var activeTab = 'Science';
function showTab(tabName) {
	if(document.getElementById) {
		objTab = document.getElementById('newsTab' + tabName);
		objTabContent = document.getElementById('news' + tabName);
		objActiveTab = document.getElementById('newsTab' + activeTab);
		objActiveTabContent = document.getElementById('news' + activeTab);
	} 
	else if(document.all && navigator.userAgent.indexOf('Mac') == -1) {
		objTab = document.all['newsTab' + tabName];
		objTabContent = document.all['news' + tabName];
		objActiveTab = document.all['newsTab' + activeTab];
		objActiveTabContent = document.all['news' + activeTab];
	}
	else return;

	objActiveTab.className = "off";
	objTab.className = "on";

	objActiveTabContent.style.display = 'none';
	objTabContent.style.display = 'block';
	
	activeTab = tabName;
}