Question about mozilla 1.3.1 browser

Hello,
 
I have given ID say 'name' to a <td> tag  in my page and I want to set
width of that <td> runtime. So I am using expression name.width ="30%".
This is perfectly working in Internet Explorer and Opera. But  it is
giving javascript error 'name is not defined'  when I use Mozilla 1.3.1.
Please advise.
 
Thanks,
 
Regards,
Parag Sewalkar,
Programmer Analyst,
Rheal Software (p) Ltd.
Mumbai - 53.