function agregarComparacion(option_id,pos)
{
var xmlhttp;
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {
  // code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
{
if(xmlhttp.readyState==4)
  {
  document.getElementById('test').innerHTML=xmlhttp.responseText;
  }
}
xmlhttp.open("GET","pixel/lib/agregarComparacion.php?oid="+option_id+"&opos="+pos,true);
xmlhttp.send(null);
}


function eliminarComparacion(pos)
{
var xmlhttp;
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {
  // code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
{
if(xmlhttp.readyState==4)
  {
  document.getElementById('test').innerHTML=xmlhttp.responseText;
  }
}
xmlhttp.open("GET","pixel/lib/eliminarComparacion.php?opos="+pos,true);
xmlhttp.send(null);
}