// change black square
function changesqon(id) {
	a = document.getElementById('sq'+id);
	a.style.backgroundPosition = '0 0'; 
	}

function changesqoff(id) {
	a = document.getElementById('sq'+id);
	a.style.backgroundPosition = '-11px 0'; 
	}
	

function changesqonb(id) {
	a = document.getElementById('sq'+id+'b');
	a.style.backgroundPosition = '0 0'; 
	}

function changesqoffb(id) {
	a = document.getElementById('sq'+id+'b');
	a.style.backgroundPosition = '-11px 0'; 
	}