function blockin(which){
	var posID = ("positive" + which);
	var negID = ("negative" + which);

	if (document.layers) {
		var current = (document.layers[posID].style.display == 'none') ? 'inline' : 'none';
		document.layers[posID].style.display = current;
		document.layers[negID].style.display = (current == 'none') ? 'inline' : 'none';
	} else if (document.all) {
		var current = (document.all[posID].style.display == 'none') ? 'inline' : 'none';
		document.all[posID].style.display = current;
		document.all[negID].style.display = (current == 'none') ? 'inline' : 'none';
	} else if (document.getElementById) {
		var current = (document.getElementById(posID).style.display == 'none') ? 'inline' : 'none';
		document.getElementById(posID).style.display = current;
		document.getElementById(negID).style.display = (current == 'none') ? 'inline' : 'none';
	}

	var contentTable = "hdRoomContent"+which;
	var currentRow = document.getElementById(contentTable);
	if (currentRow) {
		if (currentRow.style.visibility == 'hidden') {
			currentRow.style.visibility = 'visible';
			currentRow.style.display = '';
		} else {
			currentRow.style.visibility = 'hidden';
			currentRow.style.display = 'none';
		}
	}
}