Some register function

Regfunction

//the Function:
// register.php is just: <?php echo "ok" ?> 

function registerR(){
//	alert ('works1');
	var ajaxRequest3;
	if (window.XMLHttpRequest)
	{
//		alert('works2');
		ajaxRequest3 = new XMLHttpRequest();
	}
	else
	{
		ajaxRequest3 = new ActiveXObject("Mictosoft.XMLHTTP");
	}
//	alert ('works3');
	ajaxRequest3.onreadystatechange = function(){
		if(ajaxRequest3.readyState == 4){
			if(ajaxRequest3.responseText == "ok"){
				document.getElementById('regspan').innerHTML = "Registration was a success! You can now Log in.";
								alert ('works5a');
			}
			else{
				document.getElementById('regspan').innerHTML = "Registration Failed.";
				alert (ajaxRequest3.responseText);
			}
		}
	}
//	alert ('works4');
	var username = document.getElementById('user1').value;
	var password1 = document.getElementById('pass1').value;
	var password2 = document.getElementById('pass2').value;
	var query = "?usernameR=" +username +"&passwordR1=" +password1 +"&passwordR2=" +password2;
	ajaxRequest3.open("GET", "register.php" +query, true);
	ajaxRequest3.send(null);
	alert ("register.php" +query);
}