viewstate problem - invalid state information

Hi all,

I have a site to solve issues.
I found following code for on each page. I think they used it to compress page viewstate
protected override void SavePageStateToPersistenceMedium(object pageViewState)
{
LosFormatter losformatter = new LosFormatter();
StringWriter sw = new StringWriter();
losformatter.Serialize(sw, pageViewState);
string viewStateString = sw.ToString();
byte[] b = Convert.FromBase64String(viewStateString);
b = ViewStateCompressor.CompressViewState(b);
ClientScript.RegisterHiddenField("__CUSTOMVIEWSTATE", Convert.ToBase64String(b));
}

Deserialize view state
protected override object LoadPageStateFromPersistenceMedium()
{
string custState = Request.Form["__CUSTOMVIEWSTATE"];
byte[] b = Convert.FromBase64String(custState);
b = ViewStateCompressor.DecompressViewState(b);
LosFormatter losformatter = new LosFormatter();
return losformatter.Deserialize(Convert.ToBase64String(b));
}

but when I comment this one and run that then it gives me error in IE not in Firefox.
I don't want that code in new site because new site is different in design and all so I am not generating large viewstate.
how to resolve this problem?
plz help

Happy Programming!!
Rohi