js asynchronous processing progress bar_javascript skills

var loader=new Ajaxloader(this._ContentID,{Text:'loading...',Top:50});
loader.Show();

/*
Processing progress bar , Asynchronous loader
*/
var Ajaxloader=new Class();
Ajaxloader.prototype=
{
Text: 'Data loading...',
Parent:null,
Left:0,
Top:30,
Initialize:function(parentid,o)
{
//alert('Init');
Extend (this,o);
if(parentid)
{
this.Parent=$(parentid);
}
return this;
},
Show:function ()
{
if(this.Parent)
{
var _obj = this.Create();
this.Parent.appendChild(_obj);
}
},
Create:function()
{
var _div=document.createElement('div');
var _img=document.createElement('img');
_img.src ='<%=WebResource("DSKJ.Web.UI.WebControls.Images.ajaxloader.gif")%>';
_img.style.cssText='display:block;';
var _load =document.createElement('h3');
_load.innerText = this.Text;
_load.style.cssText='margin-top:5px;font-size:13px';
_div.appendChild (_img);
_div.appendChild(_load);
//Set div style
_div.style.cssText='font-size:13px;text-align:center;margin:0 auto;display :block;z-Index:99';
_div.style.marginTop=this.Top;
return _div;
}
}