// JavaScript Document
var xmlhttp;

function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}

function session(a,o)
{
  xmlhttp=GetXmlHttpObject();
  if (xmlhttp==null)
    {
      alert ("Browser does not support HTTP Request");
      return;
    }
  var url="session.php";
  url=url+"?page="+page;
  url=url+"&ans="+a;
  url=url+"&option="+o;
  xmlhttp.onreadystatechange=stateChanged;
  xmlhttp.open("GET",url,true);
  xmlhttp.send(null);
}

function stateChanged()
{
  if (xmlhttp.readyState==4)
  {
  }
}


    function checkAnswers()
    {
      for(var i=0; i<12; i++)
      {
        document.getElementById('validator'+i).style.display = 'none';
      }
      var status = 0;
      for(var i=0; i<12; i++)
      {
        if ( !isChecked("answer"+i,document.lsds_survey) )
        {
          document.getElementById('validator'+i).style.display = 'block';
          status++;
        }
      }
      if(status > 0)
        return false;
      else
        document.lsds_survey.submit();
    }
    
    function isChecked( groupName, parentForm)
    {
    	for( var i=0, limit = parentForm[groupName].length; i < limit; ++i)
    	{
    		if(parentForm[groupName][i].checked)
    			return true;
    	}
      return false;
    }
    
    function checkOption(i, o)
    {
      if(document.getElementById('validator'+i).style.visibility == 'visible')
      {
        document.getElementById('validator'+i).style.visibility = 'hidden';
      }
      session(i,o);
    }