def browser_is? name
      name = name.to_s.strip

      return true if browser_name == name
      return true if (name == 'mozilla' or name == "firefox") && browser_name == 'gecko'
      return true if name == 'ie6' && browser_name.index('ie6')
      return true if name == 'ie7' && browser_name.index('ie7')
      return true if name == 'ie' && browser_name.index('ie')
      return true if name == 'iphone' && browser_name == 'iphone'
      return true if name == 'webkit' && browser_name == 'safari'
    end
def browser_is? name
      name = name.to_s.strip

      return true if browser_name == name
      return true if (name == 'mozilla' or name == "firefox") && browser_name == 'gecko'
      return true if name == 'ie6' && browser_name.index('ie6')
      return true if name == 'ie7' && browser_name.index('ie7')
      return true if name == 'ie' && browser_name.index('ie')
      return true if name == 'iphone' && browser_name == 'iphone'
      return true if name == 'webkit' && browser_name == 'safari'
    end
check the current browser (via user agent) for the following:
 :mozilla / :firefox
 :ie6
 :ie7
 :ie
 :iphone
 :safari