function btn_nav_arrow(a) {
	var x = document.getElementById("arrow_move");
	
	
	if (a == 1) {
	x.style.left = '272px';}
	
	else if (a == 2) {
	x.style.left = '390px';}
	
	else if (a == 3) {
	x.style.left = '520px';}
	
	else if (a == 4) {
	x.style.left = '633px';}
	
	else if (a == 5){ 
	x.style.left = '640px';}
	
	else {
	x.style.left = '740px';}
}