function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		btn_home_over = newImage("images/sub/btn_home-over.gif");
		btn_moreiss_over = newImage("images/sub/btn_moreiss-over.gif");
		btn_teachers_over = newImage("images/sub/btn_teachers-over.gif");
		btn_calendar_over = newImage("images/sub/btn_calendar-over.gif");
		btn_subscript_over = newImage("images/sub/btn_subscript-over.gif");
		btn_xplorer_over = newImage("images/sub/btn_xplorer-over.gif");
		btn_readstory_over = newImage("images/sub/btn_readstory-over.gif");
		preloadFlag = true;
	}
}

/* --------------------------------------------------------------------
NAME: newsletterFunctions.js
DESC: Includes variables and functions used site-side to render layout.
-------------------------------------------------------------------- */

function $() {
	var elements = new Array();
	for (var i = 0; i < arguments.length; i++) {
		var element = arguments[i];
		if (typeof element == 'string') {
			if (document.getElementById) {
				element = document.getElementById(element);
			} else if (document.all) {
				element = document.all[element];
			}
		}
		elements.push(element);
	}

	if (arguments.length == 1 && elements.length > 0) {
		return elements[0];
	} else {
		return elements;
	}
}

function isblank(s){
	for(var i = 0; i < s.length; i++){
		var c = s.charAt(i);
		if ((c != ' ') && (c != '\n') && (c != '\t')) {
			return false;
		}
	}
	return true;
}

function isEmailAddr(email){
	var result = false
	var theStr = new String(email)
	var index = theStr.indexOf("@");
	if (index > 0) {
    	var pindex = theStr.indexOf(".",index);
		if ((pindex > index+1) && (theStr.length > pindex+1)){
			var sindex = theStr.indexOf(" ");
			if (sindex == -1){
				result = true;
			}
		}
	}
	return result;
}

function validateEmail(email_addr){
	var msg1 = "Please enter your email address.\n";
	var msg2 = "Please enter valid email address.\n";
	if ((email_addr == null) || (email_addr == "") || isblank(email_addr)){
		$("errorMsgRR").style.display = 'block';
		return false;
	}
	if (isEmailAddr(email_addr) == false){
		$("errorMsgRR").style.display = 'block';
		return false;
	}
	return true;
}

function handleEmailFormSubmit(){
	var emailAddr = $("email_addr").value;
	if (validateEmail(emailAddr)){

		var emailScript = "http://dweb.bfi0.com:9000/api/RecordUploadQueue.mpl?";
		emailScript += "client_name="+$("client_name").value;       //add params for email
		emailScript += "&client_token="+$("client_token").value;
		emailScript += "&plist_name="+$("plist_name").value;
		emailScript += "&campaign_name="+$("campaign_name").value;
		emailScript += "&action_type="+$("action_type").value;
		emailScript += "&profile_key="+$("profile_key").value;
		emailScript += "&email_addr="+$("email_addr").value;
		emailScript += "&name="+$("name").value;
		emailScript += "&grade="+$("grade").value;
		emailScript += "&zip="+$("zip").value;       	
		$("hiddenRR").src = emailScript;
		$("errorMsgRR").style.display = 'none';
		$("submitRR").style.display = 'none';
		$("successRR").style.display = 'block';
		$("email_addr").value = "";
	}
	return false;
}