function provjera(){
	
			document.getElementById('loder').style.visibility = "visible";
			var domena = document.getElementById('domain').value;
			var ext = document.getElementById('ext').value;
			
			if(domena == ''){
				alert("Niste upisali naziv domene");
                document.getElementById('loder').style.visibility = "hidden";
			}else{
			
				xmlhttp=GetXmlHttpObject();
				
				//xmlhttp=new XMLHttpRequest();
				xmlhttp.onreadystatechange= function() { 
					if (xmlhttp.readyState==4){
						if (xmlhttp.status==200){
							writeHTML(xmlhttp, "provjeraDiv");
							document.getElementById('loder').style.visibility = "hidden";
						}
					}	
				}
				
				var params = "domain="+domena+"&ext="+ext+"&option=check";	
								
				// POST	
				var url="provjera_domene.php";
				xmlhttp.open("POST",url,true);
				xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");
				xmlhttp.send(params);
				
				
			}
			
		}
		
		
		function GetXmlHttpObject(){
			//za provjeru ajax
			var xmlHttp=null;
			
			try{
				// Firefox, Opera 8.0+, Safari
				xmlHttp=new XMLHttpRequest();
			}
				  catch (e){
				  		// Internet Explorer
					  try{
						xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
					  }
					  catch (e){
						xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
				  	  }
			 }
			
			return xmlHttp;
		}
		
		
		function writeHTML(req, kojiDiv) {
			document.getElementById(kojiDiv).innerHTML = req.responseText;
		}