function HotGuestBook()
{
	ajax = new Ajax();
	ajax.add("index",0);
	ajax.post("modules/hotguestbook.php", "viewBook");
}
function prevBook(indx)
{
	ajax = new Ajax();
	ajax.add("index",indx);
	ajax.post("modules/hotguestbook.php", "viewBook");
}

function nextBook(indx)
{
	ajax = new Ajax();
	ajax.add("index",indx);
	ajax.post("modules/hotguestbook.php", "viewBook");
}

function postHotGuestBook()
{
	ajax = new Ajax();
	
	ajax.add("name", document.postBook.naam.value);
	if(email_validate(document.postBook.email.value))
	{
		ajax.add("email", document.postBook.email.value);
	}
	ajax.add("content", document.postBook.content.value);
	ajax.post("modules/hotguestbook.php", "viewBook");
}

function viewBook(return_value)
{
	document.getElementById("hotGuestBook").innerHTML = return_value;
}

function email_validate(str)
{
	var err = "0";//error
	var at="@";
	var dot=".";
	var lat=str.indexOf(at);
	var lstr=str.length;
	var ldot=str.indexOf(dot);
	if (str.indexOf(at)==-1) err = 1;
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr) err = 1;
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr) err = 1;
	if (str.indexOf(at,(lat+1))!=-1) err = 1;
	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot) err = 1;
	if (str.indexOf(dot,(lat+2))==-1)err = 1;
	if (str.indexOf(" ")!=-1)err = 1;
	if(err == 1)return false;
	else return true;
}