Various changes

[carasmo]

• Valid html when used more than once on a page
• made JS friendly variable
• Changed all screenread classes to screen-reader-text used in all Genesis themes
• Removed #button on submit forms and added class button
• removed inline css for screenread since the class is now screen-reader-text

[carasmo]

I tested this out, and it works fine with MailChimp. The code is valid html when I use this in a widget twice on the page. The only time it is odd and this is something I would mark as "not fixing" is using inside a widget created with a page builder, it doesn't error and works, but the instance is #subbox1_enews_ext_REPLACE_TO_ID (for example) instead of #subbox1_enews_ext_4 (the number changes each instance). The way around that, which I will write up a post for, is to use the shortcode any widget plugin, create the instance in the widgets panel, and use a shortcode inside the page builder. Very easy work around.