Big js script

BadScript

<script type="text/javascript">
var store_reguser;
var ajaxRequest;
function ajaxFunc()
{
	if (window.XMLHttpRequest)
	{//Code for IE7+, Firefox, Chrome, Opera, Safari
		ajaxRequest=new XMLHttpRequest();
	}
	else
	{//code for IE6, IE5
		ajaxRequest=new ActiveXObject("Microsoft.XMLHTTP");
	}
}

function usernameVer(in_, out)
{
	//function which will get data from server.
	ajaxRequest.onreadystatechange = function()
	{
		if(ajaxRequest.readyState == 4)
		{
			var input = document.getElementById(in_).value;
			if(input != "")
			{
				document.getElementById(out).innerHTML = ajaxRequest.responseText;
				if(in_ == 'user1')
				{
					if(ajaxRequest.responseText == "<img src='redcross.png' height='20' width='20' />")
					{
						document.getElementById(out).innerHTML = "<img src='greencheck.png' height='20' width='20' />"
						store_reguser = "nodisable";
						if(store_regpass == "ok")
						{
							document.getElementById('regbutton').disabled = false;
						}
					}
					if(ajaxRequest.responseText == "<img src='greencheck.png' height='20' width='20' />")
					{
						alert (document.getElementById('user1').value);
						document.getElementById(out).innerHTML = "<img src='redcross.png' height='20' width='20' />";
						store_reguser = "disable";
						document.getElementById('regbutton').disabled = true;
					}
				}
			}
			else
			{
				document.getElementById('regbutton').disabled = true;
				document.getElementById(out).innerHTML = "";
			}
		}
	}
	var usernameID = document.getElementById(in_).value;
	var queryString = "?usernameID=" +usernameID;
	ajaxRequest.open("GET", "ServerUsers.php" +queryString, true);
	ajaxRequest.send(null);


}


function loginFunction()
{
	ajaxRequest.onreadystatechange = function(){
		if(ajaxRequest.readyState == 4)
		{
			if(ajaxRequest.responseText == "ok")
			{
				console.log('passwods match');
				//setTimeout('logintosite()', 5000);
				logintosite();
			}
			else
			{
				alert (ajaxRequest.reponseText);
				document.getElementById('mySpan2').innerHTML = ajaxRequest.responseText;
			}
		}
	}
//	alert('worksABC'); // WORKS
	var usernameID = document.getElementById('usernameID').value;
	var password = document.getElementById('password').value;
	var queryString2 = "?username=" +usernameID +"&pass=" +password;
	ajaxRequest.open("GET", "checkLogin.php" +queryString2, true);
	ajaxRequest.send(null);
	alert (queryString2);
}

var store_regpass;
function confirmPass(){
	var pass1 = document.getElementById('pass1').value;
	var pass2 = document.getElementById('pass2').value;
	if(pass1 == pass2)
	{
		var greencheck = "<img src='greencheck.png' height='20' width='20' />";
		document.getElementById('confpass').innerHTML = greencheck;
		document.getElementById('regbutton').disabled = false;
		store_regpass = "ok";
		alert (document.getElementById('user1').value);
		if (store_reguser == "disable" || !store_reguser || store_reguser == "" || document.getElementById('user1').value = ""){
					alert ('store_reguser');
					document.getElementById('regbutton').disabled = true;
		}
	}
	else
	{
		store_regpass = "not ok";
		var redcross = "<img src='redcross.png' height='20' width='20' />";
		document.getElementById('confpass').innerHTML = redcross;
		document.getElementById('regbutton').disabled = true;
	}
}

function checkIfLog(){
	var user = document.getElementById('usernameID').value;
	var pass = document.getElementById('password').value;
	if(pass == "" || user == "")
	{
		document.getElementById('submitLog').disabled = true;
	}
	else
	{
		document.getElementById('submitLog').disabled = false;
	}
}

function registerR(){
	ajaxRequest.onreadystatechange = function(){
		if(ajaxRequest.readyState == 4){
			if(ajaxRequest.responseText == "ok"){
				document.getElementById('regspan').innerHTML = "Registration was a success! You can now Log in.";
			}
			else{
				document.getElementById('regspan').innerHTML = "Registration Failed.";
				alert (ajaxRequest.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;
	ajaxRequest.open("GET", "register.php" +query, true);
	ajaxRequest.send(null);
	alert ("register.php" +query);
}

function logintosite(){
	window.location = "loggedIn.php";
}
</script>