var gNavigate_Home_On = false;
var gNavigate_Courses_On = false;
var gNavigate_Facilities_On = false;
var gNavigate_Info_On = false;
var gNavigate_FindUs_On = false;
var gNavigate_Links_On = false;
var gNavigate_AirCon_On = false;
var gNavigate_Refrigeration_On = false;
var gNavigate_Building_On = false;

function showCourseOptions() {
	showField('air_con_option',true);
	showField('refrigeration_option',true);
	showField('building_option',true);
}

function hideCourseOptions() {
	showField('air_con_option',false);
	showField('refrigeration_option',false);
	showField('building_option',false);
}

// Switch On functions
function turnon_Home() {
	gNavigate_Home_On = true;
	rollOn_Home();
}

function turnon_Courses() {
	gNavigate_Courses_On = true;
	rollOnImage('courses_tab',gImageOn_Courses);
	showCourseOptions();
	//rollOn_Courses();
}

function turnon_Facilities() {
	gNavigate_Facilities_On = true;
	rollOn_Facilities();
}

function turnon_Info() {
	gNavigate_Info_On = true;
	rollOn_Info();
}

function turnon_FindUs() {
	gNavigate_FindUs_On = true;
	rollOn_FindUs();
}

function turnon_Links() {
	gNavigate_Links_On = true;
	rollOn_Links();
}


function rollOn_Home() {
	rollOnImage('home_tab',gImageOn_Home);
	hideCourseOptions();
}

function rollOff_Home() {
	if (!gNavigate_Home_On)
		rollOffImage('home_tab',gImageOff_Home);
}

function rollOn_Courses() {
	//rollOnImage('courses_tab',gImageOn_Courses);
	showCourseOptions();
}

function rollOff_Courses() {
	if (!gNavigate_Courses_On)
		rollOffImage('courses_tab',gImageOff_Courses);
}

function rollOn_Facilities() {
	rollOnImage('facilities_tab',gImageOn_Facilities);
	hideCourseOptions();
}

function rollOff_Facilities() {
	if (!gNavigate_Facilities_On)
		rollOffImage('facilities_tab',gImageOff_Facilities);
}

function rollOn_Info() {
	rollOnImage('info_tab',gImageOn_Info);
	hideCourseOptions();
}

function rollOff_Info() {
	if (!gNavigate_Info_On)
		rollOffImage('info_tab',gImageOff_Info);
}

function rollOn_FindUs() {
	rollOnImage('find_us_tab',gImageOn_FindUs);
	hideCourseOptions();
}

function rollOff_FindUs() {
	if (!gNavigate_FindUs_On)
		rollOffImage('find_us_tab',gImageOff_FindUs);
}

function rollOn_Links() {
	rollOnImage('links_tab',gImageOn_Links);
	hideCourseOptions();
}

function rollOff_Links() {
	if (!gNavigate_Links_On)
		rollOffImage('links_tab',gImageOff_Links);
}

function rollOn_AirCon() {
	rollOnImage('air_con_tab',gImageOn_ac);
}

function rollOff_AirCon() {
	if (!gNavigate_AirCon_On)
		rollOffImage('air_con_tab',gImageOff_ac);
}

function rollOn_Refrigeration() {
	rollOnImage('refrigeration_tab',gImageOn_rf);
}

function rollOff_Refrigeration() {
	if (!gNavigate_Refrigeration_On)
		rollOffImage('refrigeration_tab',gImageOff_rf);
}

function rollOn_Building() {
	rollOnImage('building_tab',gImageOn_bc);
}

function rollOff_Building() {
	if (!gNavigate_Building_On)
		rollOffImage('building_tab',gImageOff_bc);
}