//========================= pre-cache images =========================//
if (document.images) {
	var imgArray 	= new Array();
	var nav 		= new Array();
	
	nav['topnav_home'] 			= 'gif';
	nav['topnav_bookhunt']		= 'gif';
	nav['topnav_pricing']		= 'gif';
	nav['topnav_aboutus']		= 'gif';
	nav['topnav_contactus'] 	= 'gif';
	nav['topnav_membership']	= 'gif';
	nav['topnav_pictures']		= 'gif';
	
	
	for (imgName in nav) {
		preload(imgName, 'images/', nav[imgName]);
	}
}



function preload(imgName, dir, ext) {
	imgArray[imgName + '_off'] = new Image();
	imgArray[imgName + '_off'].src = dir + imgName + '_off.' + ext;
	imgArray[imgName + '_on'] = new Image();
	imgArray[imgName + '_on'].src = dir + imgName + '_on.' + ext;
}



//========================= standard rollover =========================//
function rollover(imgName, active) {
	if (document.images && document.images[imgName]) {
		active? document[imgName].src = imgArray[imgName + '_on'].src : document[imgName].src = imgArray[imgName + '_off'].src;
	}
}



// ==================== pop-up window script ====================
var popupWin = null;

function popup(theURL, winName, features) {
	popupWin = window.open(theURL, winName, features);
	if (popupWin.focus) popupWin.focus();
}