// create expiration date for 30 days

var thirtydays = new Date();
var expDate = thirtydays.getTime() + (60 * 60 * 24 * 30 * 1000);
thirtydays.setTime(expDate);



// pop-up window function

self.window.name = "mainWin";

function popWin(page)  {

	window.open(page, "confWin", "width=300,height=200,status=no,resizable=no");
}

//get the value of the specified cookie (name)

function readCookie(name) {
    var start = document.cookie.indexOf(name+"=");
    var len = start+name.length+1;
    if ((!start) && (name != document.cookie.substring(0,name.length))) return null;
    if (start == -1) return null;
    var end = document.cookie.indexOf(";",len);
    if (end == -1) end = document.cookie.length;  //begin modification
    var string_value = unescape(document.cookie.substring(len,end));
	var numeric_value = parseInt(string_value);
	return numeric_value;
 }




// if cookie exists, append to it
// if cookie does not exist, create it

function addToCart(videoNum) {

	var doExist = readCookie(videoNum); // read the cookie's value & if it exists

	if(doExist == null) {
		if(videoNum == "vid1") 
			document.cookie = "vid1=1; expires=" + thirtydays.toGMTString();
		
		if(videoNum == "vid2") 
			document.cookie = "vid2=1; expires=" + thirtydays.toGMTString();
		
		if(videoNum == "vid3") 
			document.cookie = "vid3=1; expires=" + thirtydays.toGMTString();
		
		if(videoNum == "vid4") 
			document.cookie = "vid4=1; expires=" + thirtydays.toGMTString();
	}
	else {

		var oneMore = doExist + 1;  // add one more to the quantity

		if(videoNum == "vid1") 
			document.cookie = "vid1=" + oneMore + "; expires=" + thirtydays.toGMTString();

		if(videoNum == "vid2") 
			document.cookie = "vid2=" + oneMore + "; expires=" + thirtydays.toGMTString();

		if(videoNum == "vid3") 
			document.cookie = "vid3=" + oneMore + "; expires=" + thirtydays.toGMTString();

		if(videoNum == "vid4") 
			document.cookie = "vid4=" + oneMore + "; expires=" + thirtydays.toGMTString();
	}

	// launch pop-up html window with confirmation screen, option to go to cart screen

	popWin('item_add.html');

}