function toggleBlock(elementId) {

		if (document.getElementById('region'+ elementId.substring(2,1)).style.display == "none") {
			document.getElementById(elementId).src = "images/uparrows_white.gif";
			document.getElementById('region'+ elementId.substring(2,1)).style.display = "block";
		}
		else {
			document.getElementById(elementId).src = "images/downarrows_white.gif";
			document.getElementById('region'+ elementId.substring(2,1)).style.display = "none";
		}
	}