Hiding first and last in pagination controller

gistfile1.js

	isFirst: true,
    isLast: false,
	
	prevPage: function() {
		GWVideoApp.VideosController.set('currentPage', this.currentPage - 1);
		
	},
	nextPage: function() {
		GWVideoApp.VideosController.set('currentPage', this.currentPage + 1);
		
	},
	currentPage: 1,
	onCurrentPageChange: function() {
		this.params.page = this.currentPage;
		this.getPage(this.params);
		GWVideoApp.VideosController.set('isFirst', false);
		GWVideoApp.VideosController.set('isLast', false);
		if (this.currentPage == 1) {
			GWVideoApp.VideosController.set('isFirst', true);
		}
	    if (this.currentPage == this.pages) {
			GWVideoApp.VideosController.set('isLast', true)
		}
		
	}.observes('currentPage'),