document.querySelector('#nav_bar_g').addEventListener( 'click', function( e ){
                    let a_tag = e.target;
                  	if( e.target.tagName != 'A'){
        				 a_tag = sparents( e.target, 'a' );	
        			}
                     __gaTrackers( "send","event", "Background Takeover", "Nav_Bar", a_tag.getAttribute( "href" ) );
             
                }, false);