function show(s) {
	var rg = document.getElementsByClassName("ava_overview_module");
	for (var i=0; i<rg.length; i++) {
		Element.hide(rg[i]);
	}		
	var rg = document.getElementsByClassName("ava_overview_text");
	for (var i=0; i<rg.length; i++) {
		Element.hide(rg[i]);
	}		
	var rg = document.getElementsByClassName("ava_image_map");
	for (var i=0; i<rg.length; i++) {
		Element.hide(rg[i]);
	}		
	Element.show(s+'_image');
	Element.show(s+'_desc');
}

var page_rules = {
	'#yakima_valley a' : function (element) {
		element.onclick = function() {
			show('yakima_valley');		
		}					
	},
	'#columbia_valley a' : function (element) {
		element.onclick = function() {
			show('columbia_valley');		
		}					
	},
	'#walla_walla a' : function (element) {
		element.onclick = function() {
			show('walla_walla');		
		}					
	},
	'#red_mountain a' : function (element) {
		element.onclick = function() {
			show('red_mountain');		
		}					
	},
	'#other a' : function (element) {
		element.onclick = function() {
			show('other');		
		}					
	}	
}
Behaviour.register(page_rules);