var activeSocialMedia = "facebook";

function socialMediaActivate(socialmedia) {
	if(socialmedia != activeSocialMedia) {
		activeSocialMedia = socialmedia;
		document.getElementById('facebook').style.display='none';
		document.getElementById('twitter').style.display='none';
		document.getElementById('youtube').style.display='none';
		document.getElementById('facebookButton').style.backgroundPosition='0px 0px';
		document.getElementById('twitterButton').style.backgroundPosition='0px 0px';
		document.getElementById('youtubeButton').style.backgroundPosition='0px 0px';
		
		document.getElementById(socialmedia).style.display='block';
		
		document.getElementById(socialmedia+'Button').style.backgroundPosition='-16px 0px';
	}
}