function attach_file(str,tab)
{
	var xmlhttp;
if (window.XMLHttpRequest)
  {xmlhttp=new XMLHttpRequest();
  }
else
  {xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
		if(tab==2)
    document.getElementById("attach_tab2").innerHTML=xmlhttp.responseText;
	else
	 document.getElementById("attach").innerHTML=xmlhttp.responseText;
    }
  };
xmlhttp.open("GET","attach.php?info="+str,true);
xmlhttp.send();
return false; 
}