var imgStay = "";
var arrImagesOff = new Array();
var arrImagesOn = new Array();


var urlPrefix = "/elements/buttons/";
var urlSuffix = ".gif";
var urlOver = "_on";


function preloadImage() {

	if (document.images) {
	
		for (i = 0; i < preloadImage.arguments.length; i++) {
	
			arrImagesOff[i] = new Image();
			arrImagesOff[i].src = urlPrefix + preloadImage.arguments[i] + urlSuffix;
		}
		
		for (x = 0; x < arrImagesOff.length; x++) {
			
			arrImagesOn[x] = new Image();
			arrImagesOn[x].src = urlPrefix + preloadImage.arguments[x] + urlOver + urlSuffix;
		}
	}
}


preloadImage (

	"nav1",
	"nav2",
	"nav3",
	"nav4"
	

	);

function swapImage (action, imgName, strMsg) {

	var imgObj = document.images;

	if (document.images) {

	if (action == "over") {

		if (imgStay != imgName) {
			var strUrl = urlPrefix + imgName + urlOver + urlSuffix;
			imgObj[imgName].src = strUrl;
		}
	}

	if (action == "out") {

		if (imgStay != imgName) {
			var strUrl = urlPrefix + imgName + urlSuffix;
			imgObj[imgName].src = strUrl;
		}
	}

	if (action == "click") {

		var strUrl = urlPrefix + imgName + urlOver + urlSuffix;
		imgObj[imgName].src = strUrl;
		if (imgStay != imgName) {

			if (imgStay != "") {
				var strUrl = urlPrefix + imgStay + urlSuffix;
				imgObj[imgStay].src = strUrl;
			}
		}

		imgStay = imgName;
	}

	window.status = strMsg;

	}

}

function openWindow (url, name, width, height, moveByX, moveByY) {

	var winProps = "locationbar=no,scrollbars=no,menubar=no,toolbar=no,resizable=yes,status=no,directories=no,"
			+ "fullscreen=no,height="+height+",width="+width+"";

	winPopup = window.open (url, name, winProps);
	winPopup.moveBy (moveByX, moveByY);
	winPopup.focus();
}