ajax status display like google apps

during cleanup of my files i found the following Javascript status display js class.

unfortunately i don't know from where i have downloaded it, so if you know let me know that I can update this entry and add a link to the owner.

var ajaxStatus = Class.create();
ajaxStatus.prototype = {
ajaxStatusDisplayUserMessageElementID: 'ajaxStatusDisplay_userMessage',
ajaxStatusContainerID: 'ajaxStatusContainer',
ajaxStatusContainerCssClass: 'ajaxStatusDisplay_userStyle',
userDefinedAjaxStatusContainerCssClass: false,
ajaxStatusMessageContainerID: 'ajaxStatusMessageContainer',
ajaxStatusMessageContainerCssClass: 'ajaxStatusDisplay_userMessageStyle',
userDefinedAjaxStatusMessageContainerCssClass: false,
useUserCssStylesContainerID: 'ajaxStatusDisplay_useUserCssStyles',
statusMessage: 'Loading...',
useUserCssStyles: false,
/*
Function: initialize
Description: Creates the hidden status display elements and configures
the default status message and css styles
*/
initialize: function() {
// Create the ajax status container
Element.insert(
$$('body')[0],
{'bottom':
new Element('div', {
id: this.ajaxStatusContainerID,
style: 'display: none'
})
}
);

// Create the ajax status message container
Element.insert(
$(this.ajaxStatusContainerID),
{'bottom':
new Element('div', {
id: this.ajaxStatusMessageContainerID
})
}
);

// Setup the css styles
this.setCssStyles();

// Setup the status message text
this.setStatusMessage('');

// Register the global Ajax responders
// to show hide the status container
Ajax.Responders.register({
onCreate: this.toggle.bindAsEventListener(this),
onComplete: this.toggle.bindAsEventListener(this)
});
},
setCssStyles: function() {
// If the user has defined styles
if (document.styleSheets.length > 0) {
var theRules = new Array();

// If this is Firefox or other W3C complient browser
if (document.styleSheets[0].cssRules) {
theRules = document.styleSheets[0].cssRules;
}
// If this is IE
else if (document.styleSheets[0].rules) {
theRules = document.styleSheets[0].rules;
}

// Loop over the css rules
for (i = 0; i < theRules.length; i++) {
// If the current rule matches the name of the ajax status container css class
if (theRules[i].selectorText == '.' + this.ajaxStatusContainerCssClass) {
this.userDefinedAjaxStatusContainerCssClass = true;
}
// If the current rule matches the name of the ajax status message container css class
else if (theRules[i].selectorText == '.' + this.ajaxStatusMessageContainerCssClass) {
this.userDefinedAjaxStatusMessageContainerCssClass = true;
}
}
}

// If the user definfed css styles with the specific name
// for the ajax status container
if (this.userDefinedAjaxStatusContainerCssClass) {
// Set css class name for the container
$(this.ajaxStatusContainerID).addClassName(this.ajaxStatusContainerCssClass);
}
else {
// The user has not defined the custom css style class
// so apply default style
$(this.ajaxStatusContainerID).setStyle({
position: 'absolute',
left: '45%',
top: '2px',
height: '10px'
});
}

// If the user definfed css styles with the specific name
// for the ajax status message container
if (this.userDefinedAjaxStatusMessageContainerCssClass) {
$(this.ajaxStatusMessageContainerID).addClassName(this.ajaxStatusMessageContainerCssClass);
}
else {
// The user has not defined the custom css style class
// so apply default style
$(this.ajaxStatusMessageContainerID).setStyle({
background: '#FFF1A8 none repeat scroll 0%',
color: '#000',
padding: '0pt 5px',
fontFamily: 'Arial, Helvetica, sans-serif',
fontSize: '14px',
fontWeight: 'bold',
textAlign: 'center',
width: '100%'
});
}
},
setStatusMessage: function(statusMessage) {
if (!statusMessage.empty()) {
this.statusMessage = statusMessage;
}
else {
// If there is an element on the page with a user defined status message
if ($(this.ajaxStatusDisplayUserMessageElementID)) {
// If the user's status message is inside a input element
if ($(this.ajaxStatusDisplayUserMessageElementID).readAttribute('value') != null) {
// Use the value of the input element
// for the display as the status
this.statusMessage = $F(this.ajaxStatusDisplayUserMessageElementID);
}
else {
// Use the value of the element for the display as the status
this.statusMessage = $(this.ajaxStatusDisplayUserMessageElementID).innerHTML;
}

// Hide the user's status message container
$(this.ajaxStatusDisplayUserMessageElementID).hide();
}
}

$(this.ajaxStatusMessageContainerID).update(this.statusMessage);
},
toggle: function() {
$(this.ajaxStatusContainerID).toggle();
}
};

document.observe("dom:loaded", function() {
// Create an instance of the object defined above
ajaxStatusDisplay = new ajaxStatus();
});