function singlePage() {
	var m = document.getElementById("doc2"); 
	var tabs = m.getElementsByTagName("div"); 
	var re = new RegExp("^layer");
	
	var block = 0;

	for (var i=0; i < tabs.length; i++){
		if (re.test(tabs[i].getAttribute('ID'))) {
			if(tabs[i].style.display == 'block') {
				block++;
			}
		}
	}

	if(block <= 1) {
		toggleTabs(tabs, 'block');
	} else {
		toggleTabs(tabs, 'none');
		var ftab = document.getElementById("layer0");
		ftab.style.display = 'block';
	}
}

function toggleTabs(tabs, state) {
	var re = new RegExp("^layer");
	for (var i=0; i < tabs.length; i++){
		if (re.test(tabs[i].getAttribute('ID'))) {
			tabs[i].style.display = state;
		}
	}
}