// handles the swapping out of the tabs/tables on the Lesson Plan Creator page

$(document).ready(function(){

	 $("#act_tab").click(function () {
		$("#tabs").css({'background-image' : 'url("../images/tab_activities.jpg")'});
		$("#activities").show();
		$("#worksheets").hide();
		$("#teacher").hide();
		$("#teach_link").show();
		$("#work_link").show();
		$("#act_link").hide();
		return false;
	 });
	 
	 $("#work_tab").click(function () {
		$("#tabs").css({'background-image' : 'url("../images/tab_worksheets.jpg")'});
		$("#activities").hide();
		$("#worksheets").show();
		$("#teacher").hide();
		$("#teach_link").show();
		$("#work_link").hide();
		$("#act_link").show();
		return false;
	 });
	 
	 $("#teach_tab").click(function () {
		$("#tabs").css({'background-image' : 'url("../images/tab_teach.jpg")'});
		$("#activities").hide();
		$("#worksheets").hide();
		$("#teacher").show();
		$("#teach_link").hide();
		$("#work_link").show();
		$("#act_link").show();
		return false;
	 });
	
	$("#act_link").click(function () {
		$("#tabs").css({'background-image' : 'url("../images/tab_activities.jpg")'});
		$("#activities").show();
		$("#worksheets").hide();
		$("#teacher").hide();
		$("#teach_link").show();
		$("#work_link").show();
		$("#act_link").hide();
		return false;
	 });

	 $("#work_link").click(function () {
		$("#tabs").css({'background-image' : 'url("../images/tab_worksheets.jpg")'});
		$("#activities").hide();
		$("#worksheets").show();
		$("#teacher").hide();
		$("#teach_link").show();
		$("#work_link").hide();
		$("#act_link").show();
		return false;
	 });

	 $("#teach_link").click(function () {
		$("#tabs").css({'background-image' : 'url("../images/tab_teach.jpg")'});
		$("#activities").hide();
		$("#worksheets").hide();
		$("#teacher").show();
		$("#teach_link").hide();
		$("#work_link").show();
		$("#act_link").show();
		return false;
	 });

});

function validateForm() 
{
	var str = 'invalid';
	var elem = document.getElementById('creator_form').elements;
	for(var i = 0; i < elem.length; i++)
	{
		if (elem[i].type == "checkbox")
		{
			if (elem[i].checked)
			{
				str = 'valid';
			}
		}
	}
	if (str == 'invalid')
	{
		
		$("#errors").fadeIn();
		return false;
	}
	else 
	{
		return true;
	}
}

function closeMessage()
{
	$("#errors").fadeOut();
	return false;
}

function updateTotals(elem_id)
{
	if (document.getElementById(elem_id).checked == true)
	{
		total++;
	}
	else if (document.getElementById(elem_id).checked == false)
	{
		total--;
	}
	
	if (total == 0)
	{
		$("#totals").html("0");
	}
	else
	{
		$("#totals").html(parseInt(total));
	}
	
}