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){
		
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		 
		    return false
		 }

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

 		 return true					
	}

	

   var http_request = false;
   function makePOSTRequest(url, parameters) {
	
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('Cannot create XMLHTTP instance');
         return false;
      }
      
      http_request.onreadystatechange = alertContents;
      http_request.open('POST', url, true);
      http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http_request.setRequestHeader("Content-length", parameters.length);
      http_request.setRequestHeader("Connection", "close");
      http_request.send(parameters);
   }

   function alertContents() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            //alert(http_request.responseText);
            result = http_request.responseText;
			
            document.getElementById('txtHint').innerHTML = result;   
			
	document.getElementById("email").value="";
		         } else {
            alert('There was a problem with the request.');
         }
      }
   }
   
   function get() {
	   var email=document.getElementById("email").value;
	 		if(!echeck(email))
{
	document.getElementById("txtHint").innerHTML="<p>Invalid Email Id</p>";
	document.getElementById("email").focus();
	return false;
		
		}
			else
			{
			document.getElementById('txtHint').innerHTML="<p>Processing..........</p>";
      var poststr = "email=" + encodeURI( document.getElementById("email").value )+
					"&task=insert";
					

      makePOSTRequest('post1.php', poststr);
			 }
   }
     function del() {
	 		   var email=document.getElementById("email").value;
	 		if(!echeck(email))
{
	document.getElementById("txtHint").innerHTML="<p>Invalid Email Id</p>";
	document.getElementById("email").focus();
	return false;
		
		}
			else {
			document.getElementById('txtHint').innerHTML="<p>Processing..........</p>";
      var poststr = "email=" + encodeURI( document.getElementById("email").value )+
					"&task=delete";
					

      makePOSTRequest('post1.php', poststr);
			 }
   }