check before element jquery

.before( content [, content ] )
content
Type: htmlString or Element or Text or Array or jQuery
HTML string, DOM element, text node, array of elements and text nodes,
or jQuery object to insert before each element in the set of matched elements.
content
Type: htmlString or Element or Text or Array or jQuery
One or more additional DOM elements, text nodes, 
arrays of elements and text nodes, HTML strings,
  or jQuery objects to insert before each element in the set of matched elements.