Adding a javascript event handler to a widget

How do I add a javascript event handler to a widget?  For example, how 
would I add the HTML attribute onFocus="select()" to a StringWidget?  
My suspicion is to use the attributes property of the widget, but I am 
unable to find any documentation or usage examples regarding the 
attributes property of Archetype widgets.  Any help is much 
appreciated.

  - Kamal

-------------------------------------------------------
SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media
100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33
Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift.
http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285