var xmlhttp
 //document.getElementById("general").innerHTML=xmlhttp.responseText;
function ajaxFunction()
{
//alert(str);
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  }
  var name=document.getElementById('name').value;
  var question=document.getElementById('question').value;
  var email=document.getElementById('email').value;
  //var name = document.getElementById('menu').value;
  if(name=="")
  {
	  alert("Please enter your name");
	  document.getElementById('name').focus();
	  return false;
  }
  if(email=="")
  {
	  alert("Please enter your Email");
	  document.getElementById('email').focus();
	  return false;
  }
  if (echeck(email)==false)
  {
		email="";
		document.getElementById('email').focus();
		return false
  }
var url="get_question.php";
url=url+"?name="+name+"&email="+email+"&question="+question;
//url=url+"&sid="+Math.random();
//alert(url);
xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function stateChanged()
{
if (xmlhttp.readyState==4)
  {
//alert(xmlhttp.responseText);
  document.getElementById("txtdo").innerHTML=xmlhttp.responseText;
  }
}

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 echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}