[web2py] How can I show response.flash messages with different styles?

[User]

I am using bootstrap 2.3.2 and I would like to use Bootstrap css alert 
classes to style response.flash.  These include:
alert
alert-error
alert-success
alert-info

Is there an easy way to specify the type of flash from the controller? 
I'm thinking I could do something like:

response.flash_style = 'alert-success'


and then:

     {{if response.flash:}}
       <div class="alert{{=response.flash_style or ' alert-info'}}">
       <button type="button" class="close" data-dismiss="alert">&times;</
button>
       {{=response.flash}}
       </div>
     {{pass}}  



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