Rails - May 2014 - Pass a ruby variable into js within Rails

I have a variable created by some ruby in my controller that looks like
this:

@begpoint = row["begpoint"]


and I want to pass it into some js that is referenced from within my
view:

view:

  <% javascript_include_tag "play_time" %>



js (play_time):

I am trying to pass "<beg-point> into the js [obviously that <>
is not
the right syntax just trying to denote where'd id like the variable to
end up]


var endtime = <beg-point>+10;
myPlayer= document.getElementById('example_video_1');
myPlayer.addEventListener('loadeddata', function(){
    myPlayer.currentTime = 10505.89;
    myPlayer.play();
    myPlayer.addEventListener('timeupdate', function(){
    if (myPlayer.currentTime >= endtime) {
        myPlayer.pause();
    }


Can anyone help?  Thanks

    }, false);

}, false);

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