var arImgMouseOver = new Array();
var arImgMouseOut  = new Array();

function preloadImages(imgName, imgMouseOver, imgMouseOut) {
	// load and cache the mouseover/out images
	arImgMouseOver[imgName]     = new Image();
	arImgMouseOver[imgName].src = imgMouseOver;
	arImgMouseOut[imgName]     = new Image();
	arImgMouseOut[imgName].src = imgMouseOut;
}

function mouseOver(imgName) {
	if (document.images) {
		eval("document.images['btn_" +imgName+ "'].src = arImgMouseOver['" +imgName+ "'].src");
	}
}

function mouseOut(imgName) {
	if (document.images) {
		eval("document.images['btn_" +imgName+ "'].src = arImgMouseOut['" +imgName+ "'].src");
	}
}


// #####################################

preloadImages("home","images/navigation/home_mo.gif","images/navigation/home.gif");
preloadImages("letter","images/navigation/letter_mo.gif","images/navigation/letter.gif");
preloadImages("links","images/navigation/links_mo.gif","images/navigation/links.gif");
preloadImages("making","images/navigation/making_mo.gif","images/navigation/making.gif");
preloadImages("mutual","images/navigation/mutual_mo.gif","images/navigation/mutual.gif");
preloadImages("power","images/navigation/power_mo.gif","images/navigation/power.gif");
preloadImages("private","images/navigation/private_mo.gif","images/navigation/private.gif");
preloadImages("public","images/navigation/public_mo.gif","images/navigation/public.gif");
preloadImages("seed","images/navigation/seed_mo.gif","images/navigation/seed.gif");
preloadImages("staff","images/navigation/staff_mo.gif","images/navigation/staff.gif");




/*
// set up arrays for each type of image
var mouseOver_pics = new Array();
var mouseOut_pics  = new Array();

// this function loads each of the images into the browsers cache
function preloadButtonSet(num,mouseOver,mouseOut) {
	mouseOver_pics[num]     = new Image();
	mouseOver_pics[num].src = mouseOver;
	mouseOut_pics[num]     = new Image();
	mouseOut_pics[num].src = mouseOut;
}

// this function does the mouseover
function mouseOver(num) {
 if (document.images)
  eval("document.button"+num+".src = mouseOver_pics["+num+"].src;");
 return false;
}

// this function does the mouseout
function mouseOut(num) {
 if (document.images)
  eval("document.button"+num+".src = mouseOut_pics["+num+"].src;");
  setTimeout("document.button"+num+".src = mouseOut_pics["+num+"].src;",350);
 return true;
}

// ** BEGIN CONFIGURATION **

// define the image swapping in the following format:
// preloadButtonSet(button_num,mouseOver_image_src,mouseOut_image_src)

preloadButtonSet(0,"images/navigation/making_on.gif","images/navigation/making_off.gif");
preloadButtonSet(1,"images/navigation/seed_on.gif","images/navigation/seed_off.gif");
preloadButtonSet(2,"images/navigation/staff_on.gif","images/navigation/staff_off.gif");
preloadButtonSet(3,"images/navigation/links_on.gif","images/navigation/links_off.gif");
*/