function getObject(name)
{                  
   var ns4 = (document.layers) ? true : false;
   var w3c = (document.getElementById) ? true : false;
   var ie4 = (document.all) ? true : false;

   if (ns4) return eval('document.' + name);
   if (w3c) return document.getElementById(name);           
   if (ie4) return eval('document.all.' + name);                
   return false;
}

function isOpenIDUrl( username_field , password_field  )
{
	var o = getObject( username_field );
	var o2 = getObject( password_field );

	var username = o.value;
	if ( username.length > 6 && 
		( 
		  username.substring(0,7) == "http://" || 
		  username.indexOf( "tunnus.com" ) > 0 ||
		  username.indexOf( "myopenid.com" ) > 0 
		)
	   )
	{
		o2.disabled = true;
		o2.style.visibility = "hidden";
		return true;
	}
	else
	{
		o2.disabled = false;
		o2.style.visibility = "visible";
		return false;
	}
}