function checkLogin()
{
		var emailfilter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;

		document.getElementById('notifier').style.display = "none";
		
		if (!emailfilter.test(document.getElementById('email').value) || (document.getElementById('email').value.length < 4))
		{
			document.getElementById('email').focus();
			document.getElementById('notifier').innerHTML = "<br><span style='color: red'>Please enter a valid e-mail address.</span>";
			document.getElementById('notifier').style.display = "block";
			return false;
		}
		else if ((document.getElementById('password').value == "") || (document.getElementById('password').value.length < 4))
		{
			document.getElementById('password').focus();
			document.getElementById('notifier').innerHTML = "<br><span style='color: red'>Please enter your password.</span>";
			document.getElementById('notifier').style.display = "block";
			return false;
		}

		confirmLogin();
}

function confirmLogin()
{
		var email = escape(document.getElementById('email').value);
		var password = escape(document.getElementById('password').value);
		
		var ajaxhttp = new sack();
		ajaxhttp.requestFile = "datacontrols.php?email="+email+"&password="+password+"&type=login";
		ajaxhttp.onCompletion = function()
		{  
			try
			{
				if (ajaxhttp.response == "0")
				{
					document.getElementById('notifier').style.display = "none";
					document.getElementById('notifier').innerHTML = "<br><span style='color: red'>Invalid login credentials.</span></li>";
					document.getElementById('notifier').style.display = "block";
					email=password="";
				}
				else
				{
					top.location.href="checkout.php";
					email=password="";
				}
			}
			catch (e) { alert(e.description); }
		};
		ajaxhttp.runAJAX();
}

function checkCoupon()
{
	document.getElementById('notifier').style.display = "none";
	
	// basic check
	if ((document.getElementById('coupon').value == "") || (document.getElementById('coupon').value.length < 3))
	{
		document.getElementById('coupon').focus();
		document.getElementById('notifier').innerHTML = "<br><span style=\"color: red\">Please enter a valid coupon.</span>";
		document.getElementById('notifier').style.display = "block";
		return false;
	}
	else
	{
		// we have a coupon
		var coupon = document.getElementById('coupon').value;
		
		var ajaxhttp = new sack();
		ajaxhttp.requestFile = "datacontrols.php?coupon="+coupon+"&type=coupon";
		ajaxhttp.onCompletion = function()
		{  
			try
			{
				document.getElementById('notifier').style.display = "none";
				var licqty = document.getElementById('licqty').value;
				var couponval = ajaxhttp.response;
				// invalid coupon
				if (parseFloat(couponval) == 0)
				{
					document.getElementById('coupon').focus();
					document.getElementById('notifier').innerHTML = "<br><span style=\"color: red\">That coupon is invalid and/or expired.</span>";
					document.getElementById('notifier').style.display = "block";
				}
				// valid coupon
				else
				{
					document.getElementById('notifier').style.display = "none";
					var couponvalue = parseFloat(couponval).toFixed(2);
					document.getElementById('discount').innerText = "(" + couponvalue + ")";
					// update price
					updatePrice(licqty);
					document.getElementById('ubutton').disabled='true';
				}
			}
			catch (e) { alert(e.description); }
		};
		ajaxhttp.runAJAX();
	}
}

function SetCookie(cookieName,cookieValue) 
{
	var today = new Date();
	var expire = new Date();

	expire.setTime(today.getTime() + 900000*1);
	document.cookie = cookieName+"="+escape(cookieValue) + ";expires="+expire.toGMTString()+";path=/";
}

function ReadCookie(cookieName)
{
	var theCookie=""+document.cookie;
	var ind=theCookie.indexOf(cookieName);

	if (ind==-1 || cookieName=="") 
 		return ""; 
 
	var ind1=theCookie.indexOf(';',ind);
 
	if (ind1==-1) 
 		ind1=theCookie.length; 

	return unescape(theCookie.substring(ind+cookieName.length+1,ind1));
}

function updatePrice(qty)
{
	var product_price = document.getElementById('price').innerText;
	var subtotal = parseFloat(product_price * qty);
	var discount = (document.getElementById('discount').innerText).replace(/[\(\)]/g, "");
	var shipping = document.getElementById('shipping').innerText;
	
	var total = parseFloat(subtotal - discount) + parseFloat(shipping);
	
	if (!isNaN(tax) || tax != 0 || tax != "0.00")
	{
		var taxamount = total*(tax/100);
		total += taxamount;
		document.getElementById('tax').innerText = taxamount.toFixed(2);
		SetCookie("tax", document.getElementById('tax').innerText);
		total = parseFloat(total);
	}

	SetCookie("discount1", discount);
	SetCookie("subtotal", subtotal);
	SetCookie("qty", qty);
	
	document.getElementById('subtotal').innerText = subtotal.toFixed(2);
	document.getElementById('discount').innerText = '(' + discount + ')';
	document.getElementById('total').innerText = total.toFixed(2);
	document.getElementById('paymentAmount').value = base64_encode(total.toFixed(2));
}

function base64_encode( data ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Tyler Akins (http://rumkin.com)
    // +   improved by: Bayron Guevara
    // +   improved by: Thunder.m
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)        
    // -    depends on: utf8_encode
    // *     example 1: base64_encode('Kevin van Zonneveld');
    // *     returns 1: 'S2V2aW4gdmFuIFpvbm5ldmVsZA=='
 
    // mozilla has this native
    // - but breaks in 2.0.0.12!
    //if (typeof window['atob'] == 'function') {
    //    return atob(data);
    //}
        
    var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    var o1, o2, o3, h1, h2, h3, h4, bits, i = ac = 0, enc="", tmp_arr = [];
    data = utf8_encode(data);
    
    do { // pack three octets into four hexets
        o1 = data.charCodeAt(i++);
        o2 = data.charCodeAt(i++);
        o3 = data.charCodeAt(i++);
 
        bits = o1<<16 | o2<<8 | o3;
 
        h1 = bits>>18 & 0x3f;
        h2 = bits>>12 & 0x3f;
        h3 = bits>>6 & 0x3f;
        h4 = bits & 0x3f;
 
        // use hexets to index into b64, and append result to encoded string
        tmp_arr[ac++] = b64.charAt(h1) + b64.charAt(h2) + b64.charAt(h3) + b64.charAt(h4);
    } while (i < data.length);
    
    enc = tmp_arr.join('');
    
    switch( data.length % 3 ){
        case 1:
            enc = enc.slice(0, -2) + '==';
        break;
        case 2:
            enc = enc.slice(0, -1) + '=';
        break;
    }
 
    return enc;
}

function utf8_encode ( string ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Webtoolkit.info (http://www.webtoolkit.info/)
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: sowberry
    // *     example 1: utf8_encode('Kevin van Zonneveld');
    // *     returns 1: 'Kevin van Zonneveld'
    
    string = string.replace(/\r\n/g,"\n");
    var utftext = "";
    var start, end;
 
    start = end = 0;
    for (var n = 0; n < string.length; n++) {
        var c = string.charCodeAt(n);
        var enc = null;
 
        if (c < 128) {
            end++;
        } else if((c > 127) && (c < 2048)) {
            enc = String.fromCharCode((c >> 6) | 192) + String.fromCharCode((c & 63) | 128);
        } else {
            enc = String.fromCharCode((c >> 12) | 224) + String.fromCharCode(((c >> 6) & 63) | 128) + String.fromCharCode((c & 63) | 128);
        }
        if (enc != null) {
            if (end > start) {
                utftext += string.substring(start, end);
            }
            utftext += enc;
            start = end = n+1;
        }
    }
    
    if (end > start) {
        utftext += string.substring(start, string.length);
    }
 
    return utftext;
}