Java Script Code help needed

[Helios]

Dear Computer People,
I know nothing about Java. What I understand what "Java script" means is something that one can paste into an html document or web page. What I have is a Java script code that displays a day count since 1922 December 18. Here it is.

<script>
var montharray=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")
function countup(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 paststring=montharray[m-1]+" "+d+", "+yr
var difference=(Math.round((Date.parse(todaystring)-Date.parse(paststring))/(24*60*60*1000))*1)
difference+=" Days"
document.write("The Day Count is "+difference+" at present.")
}
//enter the count up date using the format year/month/day
countup(1922,12,18)
</script>

As you can see (1922, 12, 18) is in the last line of code.
Now I would think that this day count D could be used in the function,

BLN = D*( 1749 / 51649 ) - 781 / 51649

where BLN is the "Brown Lunation Number",
and the altered code could yield an output that would appear as ( for example )

Today's Brown Lunation Number is 1075 & 48302 / 51649

If anyone can offer this Java script code, I am grateful.

 

[DavidSnider]

Not sure if I got the math right, but:

function bln(d) {
var n = d * ( 1749 / 51649 ) - 781 / 51649;
var frac = (n - parseInt(n,10));
var denom = 51649;
var numer = frac * denom;

return "Today's Brown Lunation Number is " + parseInt(n,10) + " & " + parseInt(numer,10) + " / " + denom;
}

P.S. Java and javascript are completely different languages

 

[Helios]

Dear David,
This is the page I put the code on.

http://www.helios.netne.net/brown.htm

Unfortunately, it doesn't show the output.

 

[DavidSnider]

Replace
document.write("The Day Count is "+difference+" at present.")
with
document.write(bln(difference))

 

[Helios]

Dear David,
The output is now
Today's Brown Lunation Number is NaN & NaN / 51649

http://www.helios.netne.net/brown.htm

 

[DavidSnider]

try taking out difference+=" Days"

 

[Helios]

Oh! I think it works. Thanks so much.

 

[DavidSnider]

Oh! I think it works. Thanks so much.

Also, I would suggest that in your javascript replace document.write(bln(difference)) with:

var elm = document.createElement("div");
elm.innerHTML = bln(difference);
document.body.appendChild(elm);

Document.write causes problems.