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WP Add Header Scripts will insert a script that was set between HEAD tag and HEAD tag. 
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WP Add Header Scripts

WP Add Header Scripts will insert a script that was set between HEAD tag and HEAD tag.

Andy Whalen

WP Hooks is a plugin for WordPress that allows you to add JavaScript, HTML, or other code to your 
header and footer without modifying your theme. WP Hooks uses the wp_head() and wp_footer() hooks 
built in to WordPress to add content to your header and/or footer. It’s great for those who have 
custom JavaScript, CSS, or other code (Google Analytics, meta tags, etc.) in their header or footer 
and don’t want to or can’t modify their theme.
Find <a href="http://amwhalen.com/blog/projects/wp-hooks/" rel="nofollow ugc">more instructions and discussion</a> on the WP Hooks home page.

WP Hooks

WP Hooks allows you to add JavaScript, CSS, meta tags, etc. to your header and footer without modifying your theme.

WP Add Header Scripts vs WP Hooks