var bios = new Array(4);
bios[0] = 'farrukh_shah_khan';
bios[1] = 'iFaqeer';
bios[2] = 'azleena_azhar';
bios[3] = 'abdulrahman_rafiq';

var about_us = new Array(3);
about_us[0] = 'vision';
about_us[1] = 'mission';
about_us[2] = 'bio_list';

var services = new Array(7);
services[0] = 'dr_buckholtz';
services[1] = 'past_shows';
services[2] = 'voip';
services[3] = 'technology_consulting';
services[4] = 'media_production';
services[5] = 'leadership_training';
services[6] = 'corporate_promotions';

var seminar_pages = new Array(3);
seminar_pages[0] = 'family_films_workshop';
seminar_pages[1] = 'tech_talks';
seminar_pages[2] = 'biz_talks';

var tv_pages = new Array(3);
tv_pages[0] = 'show_themes';
tv_pages[1] = 'new_shows';
tv_pages[2] = 'past_shows';

function showLayer(lyr) 
{
   document.getElementById(lyr).style.visibility = 'visible';
   document.getElementById(lyr).style.display = 'block';
}

function hideLayer(lyr) 
{
   document.getElementById(lyr).style.visibility = 'hidden';
   document.getElementById(lyr).style.display = 'none';
}

function showServices(lyr)
{
	toggle(lyr, services);
}

function showSeminar(lyr)
{
	toggle(lyr, seminar_pages);
}

function showTV(lyr)
{
	toggle(lyr, tv_pages);
}

function showAboutUs(lyr)
{
	toggle(lyr, about_us);
}

function showBio(lyr)
{
	toggle(lyr, bios);
}


function toggle(lyr, arr)
{
	for(var i=0; i<arr.length; i++)
	{
		if (arr[i] && arr[i] == lyr) {
             		showLayer(lyr);
		} else if (arr[i] && arr[i] != "") {
			hideLayer(arr[i]);
		}
	}
}