$(document).ready(function(){
	$(".navigation img").hover(
		 function() {
		  this.src = this.src.replace("_up","_down");
		 },
		 function() {
		  this.src = this.src.replace("_down","_up");
		 }
	);

	$(".action-button-contact input").hover(
		 function() {
		  this.src = this.src.replace("-up","-down");
		 },
		 function() {
		  this.src = this.src.replace("-down","-up");
		 }
	);
	
	$(".action-button-learn img").hover(
		 function() {
		  this.src = this.src.replace("-up","-down");
		 },
		 function() {
		  this.src = this.src.replace("-down","-up");
		 }
	);

});