Query abt setAttribute('width','500');

Question

Hello Every body,
I am using javascript to set the size of button.
when I use
setAttribute('width',500);
It works for ie but not for mozilla
for mozilla
setAttribute("width","191px"); works
I do not want to check navigator.appName to check browser type and then use
setAttribute('width',500); or setAttribute("width","191px");
Is there any solution
Thanks
Waiting for your response

Answer 1

Thanks guys for the help.
Just to clarify what I am looking for, here are the tables. The main table from access database is - 
                   Length
                   Width
                     No of Available pieces
300
600
20
600
400
10
900
600
5
………..the list is very long.
User enters the value : Length Needed = 900 , Width needed = 1200
Query gives this output -
Option 1
                Length
                  Width
                      No of needed pieces
300
600
6
Option 2
               Length
                  Width
                         No of neede pieces
900
600
2
Option 3
                 Length
                  Width 
                        No of needed pieces
900
600
1
300
600
3
………so on