var curElem = 0;

function hoverChanger (which) {
	var curLeftElem = document.getElementById("left_"+curElem);
	var curCenterElem = document.getElementById("center_"+curElem);
	var curRightElem = document.getElementById("right_"+curElem);
	var left = document.getElementById("left_"+which);
	var center = document.getElementById("center_"+which);
	var right = document.getElementById("right_"+which);
	
	curLeftElem.style.color = '#000000';
	curCenterElem.style.display = 'none';
	curRightElem.style.display = 'none';
	left.style.color = '#00008B';
	center.style.display = 'block';
	right.style.display = 'block';
	
	curElem = which;
}