var http=createRequestObject();
var uploader="";
var uploadDir="";
var dirname="";
var filename="";
var timeInterval="";
var idname="";

function createRequestObject() {
    var obj;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
    	return new ActiveXObject("Microsoft.XMLHTTP");
    }
    else{
    	return new XMLHttpRequest();
    }   
}
function traceUpload(session_var) {
   http.onreadystatechange = handleResponse;
   http.open("GET", 'imageupload.php?uploadDir='+uploadDir+'&dirname='+dirname+'&filename='+filename+'&uploader='+uploader+'&session_var='+session_var); 
   http.send(null);   
}
function handleResponse() {
	if(http.readyState == 4){
		var response=http.responseText; 
		if(response.indexOf("File uploaded") != -1){
			clearInterval(timeInterval);
			//document.getElementById('loading'+idname).innerHTML="";
		}
        document.getElementById(uploaderId).innerHTML=response;
		http=createRequestObject();
    }
    else {
    	document.getElementById(uploaderId).innerHTML="Uploading File. Please wait...";
    }
}
function uploadFile(obj, dname, session_var) {
	uploadDir=obj.value;
	extension=uploadDir.substr(uploadDir.lastIndexOf('.')+1);
	extension = extension.toLowerCase();
	if (extension!="doc" && extension!="txt" && extension!="pdf"){
		alert ('Fisierul trebuie sa aiba una dintre urmatoarele extensii: .doc, .txt, .pdf !');
		return true;
	}
	idname=obj.name;
	dirname=dname;
	filename=uploadDir.substr(uploadDir.lastIndexOf('\\')+1);
	//document.getElementById('loading'+idname).innerHTML="<img src='img/loading.gif' alt='loading...' />";
	uploaderId = 'uploader'+obj.name;
	uploader = obj.name;
	document.getElementById('formName'+obj.name).submit();
	timeInterval=setInterval("traceUpload('"+session_var+"')", 1500);
}