function emptySearch() {
	if (document.search_form.zoom_query.value == "") {
		alert("Please enter what you would like to search for");		return false;
	} 
		if (document.search_form.zoom_query.value == "Enter Keywords") {
		alert("Please enter what you would like to search for");		return false;
	}
	else
		return true;
}

function clearText() { 
	document.submitEmail.email.value = "";
}

function clearSearchText() { 
	document.search_form.keyword_search.value = "";
}

function submitForm() {
	document.emailPage.action = "/emailPage1.php";
	document.emailPage.submit();
}

function submitDonation() {
	document.donate.action = "https://www.paypal.com/cgi-bin/webscr";
	document.donate.submit();
}

function submitSubscribeUS() {
	document.subscribeUS.action = "https://www.paypal.com/cgi-bin/webscr";
	document.subscribeUS.submit();
}

function submitSubscribeCan() {
	document.subscribeCan.action = "https://www.paypal.com/cgi-bin/webscr";
	document.subscribeCan.submit();
}

function submitSubscribeNoUS() {
	document.subscribeNoUS.action = "https://www.paypal.com/cgi-bin/webscr";
	document.subscribeNoUS.submit();
}

function submitSubscribe() {
	document.subscribe.action = "https://www.paypal.com/cgi-bin/webscr";
	document.subscribe.submit();
}

function submitPurchaseIssue() {
	document.issue.action = "https://www.paypal.com/cgi-bin/webscr";
	document.issue.submit();
}

function submitPurchaseBook() {
	document.book.action = "https://www.paypal.com/cgi-bin/webscr";
	document.book.submit();
}

function viewCart() {
	document.cart.action = "https://www.paypal.com/cgi-bin/webscr";
	document.cart.submit();
}

function popUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=1,menubar=0,resizable=0,width=500,height=350');");
}

function dutchOvenPopUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=1,menubar=0,resizable=0,width=400,height=450');");
}

function emailValidation() {
	
var emailFilter=/^([a-z0-9_]|\-|\.)+@(([a-z0-9_]|\-)+\.)+[a-z]{2,4}$/;

if (document.submitEmail.email.value == "Enter Your Email Here...") {
		alert("Please enter an email address");		
		return false;
}

if (document.submitEmail.email.value == "") {
		alert("Please enter an email address");		
		return false;
}
	
if (!emailFilter.test(document.submitEmail.email.value)){
		alert("Please enter a valid email address");
		return false;	
	} else
		return true;
}

// ****************************************************************************
// Added the following function to manage tab content visibility
// ****************************************************************************
function fShowHideTabContent( vTabNum )
{
	fHideElementByID( 'tab1' );
	fHideElementByID( 'tab2' );
	fHideElementByID( 'tab3' );
	fHideElementByID( 'tab4' );
	fHideElementByID( 'tab5' );
	
	document.getElementById( 'tab' + vTabNum ).style.display = 'block';
}

function fHideElementByID( vID )
{
	vElement = document.getElementById( vID );
	vElement.style.display = 'none';
}