Rails - Mar 2006 - Get width of an element using javascript

I need to get the width of an element into a ruby variable.

I have tried using various methods to call a javascript function that''s
in the prototype library called getDemensions. I''m just not sure how to
perform the call.

document.GetElementById(id).offsetWidth works fine with and onClick 
event, but I need to get the width value at various time during the page 
load. I also tried the remote_function and javascript_tag methods, to no 
avail.

How do I call javascript without an event in rails?

Any suggessions?

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