//rollover engine
var other1;
var other2;

function navOver(imgCode)
{
	document.images[imgCode].src = eval(imgCode+"_over.src");
}

function navOut(imgCode)
{
	document.images[imgCode].src = eval(imgCode+".src");
}

function navBack(imgCode)
{
	document.images[imgCode].src = eval("n_"+imgCode+"_on.src");
}


function diagCodeSwitch(chgImg) {
	var diagCode; 
	switch (chgImg) {
		case "ctr_top_left":
		diagCode = "ctr_btm_right";
		other1 = "ctr_btm_left";
		other2 = "ctr_top_right";
		break;
		
		case "ctr_top_right":
		diagCode = "ctr_btm_left";
		other1 = "ctr_top_left";
		other2 = "ctr_btm_right";
		break;
		
		case "ctr_btm_left":
		diagCode = "ctr_top_right";
		other1 = "ctr_btm_right";
		other2 = "ctr_top_left";
		break;
		
		case "ctr_btm_right":
		diagCode = "ctr_top_left";
		other1 = "ctr_btm_left";
		other2 = "ctr_top_right";
		break;
	}
	return diagCode;
}

function ctrOver(imgCode) {
	var diagCodeResult = diagCodeSwitch(imgCode);
	document.images[diagCodeResult].src = eval(diagCodeResult+"_copy.src");
	document.images[other1].src = ctr_blank.src;
	document.images[other2].src = ctr_blank.src;
}

function ctrOut(imgCode) {
	var diagCodeResult = diagCodeSwitch(imgCode);
	document.images[diagCodeResult].src = eval(diagCodeResult+".src");
	document.images[other1].src = eval(other1+".src");
	document.images[other2].src = eval(other2+".src");
}