javascript - random css animation on hover -

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i have javascript when hover plays animation, have 4 different animations , randomize each time element hovered over

here's code

function firsthelp() {   document.getelementbyid('help-text').innerhtml = 'enter first name';   document.getelementbyid('help-box').style.animation ='greenhover 2s;';   document.getelementbyid('help-box').style.webkitanimation ='greenhover 2s';   }

the other css animations bluehover orangehover , purplehover 

    function getrandomanimation(duration) {        var possibleanimations = ["greenhover","bluehover","orangehover","purplehover"];       var randomnumber = math.floor((math.random()*4));       return (possibleanimations[randomnumber] + " " + duration || "");     }

and use this:

  document.getelementbyid('help-box').style.animation = getrandomanimation('2s)';

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