function active(tab) {
	document.getElementById('tabimg'+tab).src = 'images/home_tab'+tab+'_active.gif';
}
function inactive(tab) {
	document.getElementById('tabimg'+tab).src = 'images/home_tab'+tab+'_inactive.gif';
}
function showhide(tab) {
	for (i=1;i<=2;i++) {
		if (i==tab) {
			document.getElementById('blocktab'+i).style.display = 'block';
			active(i);
		} else {
			document.getElementById('blocktab'+i).style.display = 'none';
			inactive(i);
		}
	}
}