function expand(number) {
	
	for (i=1; i < 4; i++) {

		if (i!==number) {
			var offBlocksOn = 'on' + i;
			document.getElementById(offBlocksOn).style.display = 'none';
			var offBlocksOff = 'off' + i;
			document.getElementById(offBlocksOff).style.display = 'block';
		}

		else {
			var onBlockOn = 'on' + number;
			document.getElementById(onBlockOn).style.display = 'block';
			var onBlockOff = 'off' + number;
			document.getElementById(onBlockOff).style.display = 'none';
		}			
			
	}		

}