var behaviour = { 
	'.preview' : function(element) {
		element.onmouseover = function() {
			$(element.id.replace("p","z")).style.display = "block";
		}
		
		element.onmouseout = function() {
			$(element.id.replace("p","z")).style.display = "none";
		}
	},
	
	'.zoom' : function(element) {
		element.onmouseover = function() {
			element.style.display = "block";
		}
		
		element.onmouseout = function() {
			element.style.display = "none";
		}
	}
}
Behaviour.register(behaviour);