window.onLoad = function()
{
alert('hi loaded');
var clickButton = document.getElementById("checkusername"); /* check username button */

clickButton.onClick = function()
{
 alert('Hi!');
 var spanTag = document.getElementById("checkoutput");
 var usernameText = document.getElementById("username");

 if (usernameText !== usernameText)
 {
 var reqUrl = "/register/" + usernameText.value + "/";


 var handleSuccess = function(o){
 if(o.responseText !== undefined)
 {
 spanTag.innerHTML = "<li>Transaction id: " + o.tId + "</li>";
 spanTag.innerHTML += "<li>HTTP status: " + o.status + "</li>";
 spanTag.innerHTML += "<li>Status code message: " + o.statusText + "</li>";
 spanTag.innerHTML += "<li>HTTP headers: <ul>" + o.getAllResponseHeaders + "</ul></li>";
 spanTag.innerHTML += "<li>Server response: " + o.responseText + "</li>";
 spanTag.innerHTML += "<li>Argument object: Object ( [foo] => " + o.argument.foo +
 " [bar] => " + o.argument.bar +" )</li>";
 }
 }

 var handleFailure = function(o)
 {
 if(o.responseText !== undefined){
 spanTag.innerHTML = "<li>Transaction id: " + o.tId + "</li>";
 spanTag.innerHTML += "<li>HTTP status: " + o.status + "</li>";
 spanTag.innerHTML += "<li>Status code message: " + o.statusText + "</li>";
 }
 }

 var callback =
 {
 success:handleSuccess,
 failure: handleFailure
 //argument: { foo:"foo", bar:"bar" }
 };

 var request = YAHOO.util.Connect.asyncRequest('GET', reqUrl, callback);
 }
};

};