var isIE  = (navigator.appVersion.indexOf("MSIE") != -1) ? true : false;
var isWin = (navigator.appVersion.toLowerCase().indexOf("win") != -1) ? true : false;
var isOpera = (navigator.userAgent.indexOf("Opera") != -1) ? true : false;

var requiredMajorVersion = 9;
var requiredMinorVersion = 0;
var requiredRevision = 28;

var xmlHttp;

function fetch(tag){
	return document.getElementById(tag);
}

function createXMLHttpRequest(){
	if(window.ActiveXObject){
		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
	} else if(window.XMLHttpRequest){
		xmlHttp = new XMLHttpRequest();
	}
}

function setPageCallback(){
	if(xmlHttp.readyState == 4){
		if(xmlHttp.status == 200){
			document.getElementById("content").innerHTML = xmlHttp.responseText;
			getcontent_height();
		}
	}
}

function setPage(page){
	createXMLHttpRequest();
	xmlHttp.open("POST", "php/main.php", true);
     xmlHttp.onreadystatechange = setPageCallback;
	xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	xmlHttp.send('page='+page);
	document.getElementById("content").innerHTML = "Loading...";
	
}
function posaljiMail(){
	if(fetch('ime').value!='' && fetch('naslov').value!='' && fetch('email').value!='' && fetch('poruka').value!=''){
		document.getElementById("content").innerHTML = "<div align='center'>Email uspjesno poslan!<br><a href=\"#\" onclick=\"setPage('mail')\">[nazad]</a></div>";
	} else {
		window.alert("Morate popuniti sva polja!");
	}
}