var loc = location.href;
var test = loc.indexOf("https://");
var protocol = (test == -1) ? "http://" : "https://";

var MAX_NEWS_ITEMS = 4;

var tnArr = new Array ("nav_home","nav_news","nav_dist","nav_about","nav_tech","nav_contact","nav_store");
var tnArrOn = new Array();
var tnArrOff = new Array();

// preload top menu images
for (var i=0; i< tnArr.length; i++) {
	tnArrOff[i] = new Image();
	tnArrOn[i] = new Image();
	tnArrOff[i].src = protocol + "powerflexusa.com/imgs/" + tnArr[i] + "_off.gif";
	tnArrOn[i].src = protocol + "powerflexusa.com/imgs/" + tnArr[i] + "_on.gif";
}


function tn_on (id) {
	var index = getIndexFromArray(id,tnArr);
	if ( document.images ) {
		butOn = tnArrOn[index].src;
		document.getElementById(id).src = butOn;
	}
}
function tn_off (id) {
	var index = getIndexFromArray(id,tnArr);
	if ( document.images ) {
		butOff = tnArrOff[index].src;
		document.getElementById(id).src = butOff;
	}
}

function clearForm (element) {
	element.value = '';
}
function getIndexFromArray (lookup, arr) {
	var index = 0;
	for (var i=0; i < arr.length; i++) {
		if (lookup == arr[i]) {
			index = i;
			break;
		}
	}
	return index;
}
function clearOptin () {
	var currVal = $('optin').value;
	$('optin').value = (currVal == "Enter email address") ? '' : currVal;
}