function isSet( variable ) {
	return( typeof( variable ) != 'undefined' );
}

function showDiv(id) {
	for (var i = 1; i < 4; i++){
		var theDiv = document.getElementById('res' + i);
		var thePlus = document.getElementById('tab' + i);
		var theLink = document.getElementById('link' + i);
		var theCont = document.getElementById('foot');
		if (id < 1) {
			id = 1;
		}
		if (i == id) {
			theDiv.style.display = "";
			thePlus.style.background = 'url(/g/tabactive.gif) top left repeat-x';
			theLink.style.color = '#fff';
			theCont.style.bottom = '';
			theCont.style.bottom = '0';
		} else if (theDiv) {
			theDiv.style.display = "none";
			thePlus.style.background = 'transparent';
			theLink.style.color = '#555';
			theCont.style.bottom = '';
			theCont.style.bottom = '0';
		}
	}
}