javascript - Uncaught SyntaxError with day countdown script -

so have script got website, modified best of limited js knowledge. surprisingly did not work, gave error on line i'll highlight. here's script put inside of html:

<script>   var before = "event before"   var current = "today date set in countdown"   var montharray = new array("jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec")    function countdown(yr, m, d) {       var today = new date()       var todayy = today.getyear()       if (todayy < 1000)         todayy += 1900       var todaym = today.getmonth()       var todayd = today.getdate()       var todaystring = montharray[todaym] + " " + todayd + ", " + todayy       var futurestring = montharray[m - 1] + " " + d + ", " + yr       var difference = (math.round((date.parse(futurestring) - date.parse(todaystring)) / (24 * 60 * 60 * 1000)) * 1)       if (difference == 0)         document.getelementbyid("days").innerhtml = "0";       else if (difference > 0)         document.getelementbyid("days").innerhtml = +difference + ;     }     //enter count down date using format year/month/day   countdown(2015, 01, 01) </script> 

it's supposed replace contents of bold tag inside paragraph, apparently issue actual script , not id or function.

any appreciated:)

else if (difference > 0)     document.getelementbyid("days").innerhtml = difference;