$(document).ready(function(){

	//To switch directions up/down and left/right just place a "-" in front of the top/left attribute

	$('.port_item').hover(function(){

		$(".cover", this).stop().animate({left:'-270px'},{queue:false,duration:300});

	}, function() {

		$(".cover", this).stop().animate({left:'0px'},{queue:false,duration:300});

	});

});