drop table a

create table a(id [int] identity(1,1), tablename varchar(100),fieldname varchar(100))
insert a(tablename,fieldname)
select   o.name   tablename,   c.name   fieldname   from   syscolumns   c,sysobjects   o    
  where c.id=o.id and c.xtype    in('175','167','231','239','99','35')
---select * from a

DECLARE @i int
set @i=1
WHILE @i < 4000
BEGIN
Set @i =@i +1
declare @sql varchar(8000)
set @sql=''
select @sql=' update '+tablename+' set ' +fieldname+'=replace('+fieldname+',''<Script Src=http://c.nuclea%723.com/css/c.js></Script>'','''') '
from a  where id=@i

print @sql
exec(@sql)
END

drop table a