var toggleVisibility = function(callingElm,targetElm) {
	new Effect.toggle(
		$(targetElm), 
		'blind', 
		{       
			// Change the expand collapse button
			afterFinish : function () { $(callingElm).className = $(callingElm).className.match(/expand/) ? "collapse_button" : "expand_button"; } 
		}
	);
}