$.fn.scrollWin = function(){
	$('html, body').animate({
		scrollTop: $(this).offset().top
	}, 1000);
}

// begin document load
$(document).ready(function() {		

	
	/* presentation tabs */
	var $tabs = $('#presentation-wrapper').tabs(); 
	var selected = $tabs.data('selected.tabs');
	var totalSize = $(".ui-tabs-panel").size() - 1;
	
	if (selected == totalSize) {
		$('#presentation-wrapper .next-frame').addClass('disabled');
	}
	if (selected == 0) {
		$('#presentation-wrapper .back-frame').addClass('disabled');
	}
	
	$('#presentation-nav a').bind('click', function() { 
		var selected = $tabs.data('selected.tabs');
		var totalSize = $(".ui-tabs-panel").size() - 1;
		if (selected >= totalSize) {
			$('#presentation-wrapper .next-frame').addClass('disabled');
		} else {
			$('#presentation-wrapper .next-frame').removeClass('disabled');
		}
		
		if (selected <= 0) {
			$('#presentation-wrapper .back-frame').addClass('disabled');
		} else {
			$('#presentation-wrapper .back-frame').removeClass('disabled');
		}
		
		//GA Tracking
		if (_gaq) {
			_gaq.push(['_trackPageview', location.pathname + $(this).attr("href")]);
		}
		 
		$('#content').scrollWin();
		return false; 
	});
	
	$('#presentation-wrapper .next-frame').click(function() { 
		var selected = $tabs.data('selected.tabs');
		var nextTab = selected + 1;
		var tab_href = "#"+$(".ui-tabs-panel:eq(" + nextTab + ")").attr('id');
		var totalSize = $(".ui-tabs-panel").size() - 1;
		
		$('#presentation-wrapper .back-frame').removeClass('disabled');
		
		if (selected + 1 >= totalSize) {
			$(this).addClass('disabled');
		} else {
			$(this).removeClass('disabled');
		}
		
		//alert(tab_href);
		
		if (selected != totalSize) {
			//$.history.load(tab_href.replace(/^.*#/, ''));
			$tabs.tabs('select', selected + 1);
		}
		
		$('#content').scrollWin();
		return false; 
	});
	
	$('#presentation-wrapper .back-frame').click(function() { 
		var selected = $tabs.data('selected.tabs');
		var prevTab = selected - 1;
		var tab_href = "#"+$(".ui-tabs-panel:eq(" + prevTab + ")").attr('id');
		var totalSize = $(".ui-tabs-panel").size() - 1;
		
		$('#presentation-wrapper .next-frame').removeClass('disabled');

		if (selected - 1 <= 0) {
			$(this).addClass('disabled');
		} else {
			$(this).removeClass('disabled');
		}
		
		if (selected != 0) {
			//$.history.load(tab_href.replace(/^.*#/, ''));
			$tabs.tabs('select', selected - 1); 
		}
		$('#content').scrollWin();
		return false; 
	});
	
	if (window.location.hash != '' && window.location.hash.indexOf("section") < 0) {
		//get the index
		var $tabs = $("#presentation-wrapper").tabs('select',window.location.hash);
		var selected = $tabs.data('selected.tabs');
		var totalSize = $(".ui-tabs-panel").size() - 1;
		
		if (selected >= totalSize) {
			$('#presentation-wrapper .next-frame').addClass('disabled');
		} else {
			$('#presentation-wrapper .next-frame').removeClass('disabled');
		}
		
		if (selected <= 0) {
			$('#presentation-wrapper .back-frame').addClass('disabled');
		} else {
			$('#presentation-wrapper .back-frame').removeClass('disabled');
		}
	} else if (window.location.hash == '') {
		var $tabs = $("#presentation-wrapper").tabs('select',0);
		var selected = $tabs.data('selected.tabs');
		var totalSize = $(".ui-tabs-panel").size() - 1;
		
		if (selected >= totalSize) {
			$('#presentation-wrapper .next-frame').addClass('disabled');
		} else {
			$('#presentation-wrapper .next-frame').removeClass('disabled');
		}
		
		if (selected <= 0) {
			$('#presentation-wrapper .back-frame').addClass('disabled');
		} else {
			$('#presentation-wrapper .back-frame').removeClass('disabled');
		}
	}
	
	
	// presentation TOGGLE show & hide
	$("a.toggle-link").each(function() {	
		$(this).click(function() {
			if ($(this).hasClass('open')) {
				$(this).removeClass('open');
			} else {
				$(this).addClass('open');
			}
		 	$(this).next('div').slideToggle('slow'); 
        	return false;
		});
    });
});