function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    {
    c_start=c_start + c_name.length+1;
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    }
  }
return "";
}
function vote() {
	var xmlHttp = getXmlHttpObject();
	var votedOption = getOption();
		if (votedOption === false) {
			alert ("Select an option!");
			return false;
		}
		if (!getCookie ('user')) {
			alert ("You must be logged in to vote!");
			return false;
		}
		if (!xmlHttp) {
			alert ("Browser does not support XMLHTTP!");
			return false;
		}
		xmlHttp.onreadystatechange = function() {
			if (xmlHttp.readyState == 4)
				document.getElementById("vote").innerHTML = xmlHttp.responseText;
			else
				document.getElementById("vote").innerHTML = "<img src='images/loading.gif' alt='Please wait...' />";
		}

	xmlHttp.open ("GET","poll.php?opt=" + votedOption,true);
	xmlHttp.send (null);
}
function getOption() {
	var elems = document.getElementsByClassName('voteb');
		for (var i = 0; i < elems.length; i++) {
			if (elems[i].checked)
				return i;
		}
}
function getXmlHttpObject() {
	xmlHttp=null;
		try {
			xmlHttp=new XMLHttpRequest();
		}
		catch (e) {
			try {
  				xmlHttp=new ActiveXObject('Msxml2.XMLHTTP');
  			}
 			catch (e) {
  				xmlHttp=new ActiveXObject('Microsoft.XMLHTTP');
 			}
		}
	return xmlHttp;
}