function ajax(){
var username=escape(document.getElementById("textarea").value);
var password=escape(document.getElementById("textarea1").value);
var ajax=new XMLHttpRequest();
ajax.open("post","login.php",true);
ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
ajax.send("u="+username+"&p="+password);
ajax.onreadystatechange= function(){
if(ajax.readyState==4 && ajax.status == 200){
var response=ajax.responseText;
if(response == "success"){
window.location.href="welcome.php";
}else{
var response=ajax.responseText;
document.getElementById("response").style.color="red";
document.getElementById("response").innerHTML=ajax.responseText;
if(response=="success"){
location.href="welcome.php";
}
}
}
}
}