$(document).ready(function(){
$('.portImage').fadeTo('slow', 0.5) //sets opacity to 0.5 on page load
		$('.portImage').hover(function() {
			$(this).fadeTo('slow', 1.0); //sets opacity to full on hover
			},function(){
			$(this).fadeTo('slow', 0.5); //sets opacity to 0.5 on mouse out
	});
});