function showRSS(str)
{
		if (str.length==0)
		  { 
		  document.getElementById("rssOutput").innerHTML="the string is empty";
		  return;
		  }
		if (window.XMLHttpRequest)
		  {// code for IE7+, Firefox, Chrome, Opera, Safari
		  xmlhttp=new XMLHttpRequest();
		  }
		else
		  {// code for IE6, IE5
		  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
		  }
		xmlhttp.open("GET","js/getRSS.php?feed="+str,false);
		xmlhttp.send();
		document.getElementById("rssOutput").innerHTML=xmlhttp.responseText;
}