function makeVote(url, parameters) {
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('Não consegue criar a instância XMLHTTP');
         return false;
      }
      
      http_request.onreadystatechange = alertVote;
      http_request.open('POST', url, true);
      http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http_request.setRequestHeader("Content-length", parameters.length);
      http_request.setRequestHeader("Connection", "close");
      http_request.send(parameters);
   }

   function alertVote() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            result = http_request.responseText;
            document.getElementById('vote_msg').innerHTML = result;            
         } else {
            alert('Teve um problema com a chamada.');
         }
      }
   }
   
function getCheckedValue(radioObj) {
	if(!radioObj)
		return "";
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return "";
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return "";
}
 
   function submit_vote(obj) {
	  var vote_value = getCheckedValue(document.forms['vote-form'].elements['opt']);
      var poststr = "poll_id=" + encodeURI( document.getElementById("poll_id").value ) +
                    "&voteid=" + encodeURI( vote_value);				
      makeVote('vote.php', poststr);
   }

function getxmlhttp(){
		var page_request = false;
		if (window.XMLHttpRequest){
			return xmlhttp = new XMLHttpRequest();
		}else if (window.ActiveXObject){
			try {
				return xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
			}catch (e){
				try{
					return xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
				}catch (e){}
			}
		}else{
			return false
		}
	}
	
	function getpage(url, container){
		xmlhttp = getxmlhttp();
		xmlhttp.open('GET', url);
		xmlhttp.onreadystatechange = function(){
			if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
				document.getElementById(container).innerHTML = xmlhttp.responseText;
			}else{
			document.getElementById(container).innerHTML = "<h3>Carregando.....</h3>";
			}			
		}
		xmlhttp.send(null);
	}