function GetXmlHttpObject(){ 
        var objXMLHttp=null
        if (window.XMLHttpRequest){
          objXMLHttp=new XMLHttpRequest()
        }else if (window.ActiveXObject){
          objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
        }
        return objXMLHttp
      }

      function obnova(kolo){
        drawimage(kolo);
        kolo++;
        setTimeout("obnova("+kolo+")", 10000);
        if(kolo/6==Math.round(kolo/6)){
          checkonline();
    		}
      }
      
      function checkonline(){
    		xmlHttp=GetXmlHttpObject()
		    if (xmlHttp==null){
			     alert ("Browser does not support HTTP Request")
			     return
		    } 
		    var url='online.php';
		    xmlHttp.onreadystatechange=refreshuj; 
		    xmlHttp.open("GET",url,true);
    		xmlHttp.send(null);
      }

	function refreshuj() 
	{ 
		if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
			{ 
    		document.getElementById('online').innerHTML=xmlHttp.responseText;
			} 
	}	
      
      function drawimage(kolo){
        var camimage=document.getElementById('camimage');
        camimage.src= 'image.php?'+kolo;
      }