var myrules = {
	'#comments' : function(element){
		element.onfocus = function(){
			if (this.value == "Please leave your comments here") {
				this.value = "";
			}
		},
		element.onblur = function(){
			if (this.value == "") {
				this.value = "Please leave your comments here";
			}
		}
	}
};

Behaviour.register(myrules);