function show_details ( span,rows ) {
	for (var i = 0; i < rows; i++) {
		if (i != span) { document.getElementById( "detail" + i ).style.display = 'none'; }
		if (i != span) { document.getElementById( "preview" + i ).style.display = 'block'; }
	}
	document.getElementById( "detail" + span ).style.display = 'block';
	document.getElementById( "preview" + span ).style.display = 'none';
}

function close_details ( span ) {
	document.getElementById( "detail" + span ).style.display = 'none';
	document.getElementById( "preview" + span ).style.display = 'block';
}