var pageNum = 0;

function completeNavigation(response, ownerDivId){
	var newContent = response.responseText;
	$(ownerDivId).innerHTML = newContent;
}

function next(url, ownerDivId){
	new Ajax.Request('./service?'+url, {
		onSuccess: function(response){
			completeNavigation(response, ownerDivId);
		}
	});
	pageNum--;
}

function previous(url, ownerDivId){
	new Ajax.Request('./service?'+url, {
		onSuccess: function(response){
			completeNavigation(response, ownerDivId);
		}
	});
	pageNum++;
}