function openpage(url, containerid, pren){
var page_request = false
if (window.XMLHttpRequest) // if Mozilla, Safari etc
page_request = new XMLHttpRequest()
else if (window.ActiveXObject){ // if IE
try {
page_request = new ActiveXObject("Msxml2.XMLHTTP")
} 
catch (e){
try{
page_request = new ActiveXObject("Microsoft.XMLHTTP")
}
catch (e){}
}
}
else
return false
page_request.onreadystatechange=function(){
loadpage(page_request, containerid)
}
page_request.open('GET', url+'.php?dg='+pren, true)
page_request.send(null)
}

function loadpage(page_request, containerid){
if(checkReadyState(page_request, containerid))
	{
		document.getElementById(containerid).innerHTML=page_request.responseText; 
	}
}

function checkReadyState(page_request, containerid)
{
	if(page_request.readyState < 4) { 
		document.getElementById(containerid).innerHTML = "<div align=center>Loading...</div>"; }
	if(page_request.readyState == 4)
	{
		if(page_request.status == 200)
		{
			return true;
		}
		else if(page_request.status == 404)
		{
			// Add a custom message or redirect the user to another page
			document.getElementById(containerid).style.textAlign='center';
			document.getElementById(containerid).innerHTML = "File not found";
		}
		else
		{
			document.getElementById(containerid).innerHTML = "There was a problem retrieving the XML.";
		}
	}
}

function combo(selectobjID, loadarea){
var selectobj=document.getElementById? document.getElementById(selectobjID) : ""
if (selectobj!="" && selectobj.options[selectobj.selectedIndex].value!="")
openpage(selectobj.options[selectobj.selectedIndex].value, loadarea)
}
   
function get(obj) {
      for (i=0; i<obj.childNodes.length; i++) {
         if (obj.childNodes[i].tagName == "INPUT") {
            if (obj.childNodes[i].type == "text") {
               pren = obj.childNodes[i].value;
            }
         }   
         if (obj.childNodes[i].tagName == "SELECT") {
            var sel = obj.childNodes[i];
            pren +=  "&" + sel.name + "=" + sel.options[sel.selectedIndex].value + "&";
         }
         
      }
      openpage('pretraga', 'lista', pren);
}