//preload rollover images
if (document.images) {
	home = new Image(46,16); 
	home.src="images/nav_home_over.gif";
	
	samples = new Image(67,16); 
	samples.src="images/nav_samples_over.gif";
	
	who = new Image(36,16); 
	who.src="images/nav_who_over.gif";
	
	why = new Image(35,16); 
	why.src="images/nav_why_over.gif";
	
	what = new Image(40,16); 
	what.src="images/nav_what_over.gif";
	
	when = new Image(45,16); 
	when.src="images/nav_when_over.gif";
	
	press = new Image(43,16); 
	press.src="images/nav_press_over.gif";
	
	contact = new Image(61,16); 
	contact.src="images/nav_contact_over.gif";
}
//mouseover on social media
function ballonPop(id) {
	if(id == "twitter-show") 
		document.getElementById('twit-ballon').style.visibility = 'visible';
	if(id == "twitter-hide") 
		document.getElementById('twit-ballon').style.visibility = 'hidden';
	if(id == "facebook-show") 
		document.getElementById('fb-ballon').style.visibility = 'visible';
	if(id == "facebook-hide") 
		document.getElementById('fb-ballon').style.visibility = 'hidden';
	if(id == "linkedin-show") 
		document.getElementById('in-ballon').style.visibility = 'visible';
	if(id == "linkedin-hide") 
		document.getElementById('in-ballon').style.visibility = 'hidden';
	if(id == "youtube-show") 
		document.getElementById('yt-ballon').style.visibility = 'visible';
	if(id == "youtube-hide") 
		document.getElementById('yt-ballon').style.visibility = 'hidden';
}

//function used to create mailto link and hide email addresses from spiders to prevent spam
function mailto(username,domain,class_name){
	var linktext = username + "@" + domain;
	document.write('<a href="' + 'mail' + 'to:' + username + '@' + domain + '" class="'+class_name+'">'+linktext+'</a>');
}