Is it possible to combine this javascript function into JQuery?

I have a function written in javascript and I'd like to know how, if it's possible, to use it in my JQuery file. I'm using the following function and my selector id is '#comments'.

Again, all I want to do is just consolidate this function which now resides in another file, into my main JQuery file. Is this possible?

onkeydown="textCounter(this.form.notes, this.form.remLen,240); "onkeyup="textCounter(this.form.notes, this.form.remLen, 240);"

The selector id is #comments.

function textCounter( field, countfield, maxlimit ){
if ( field.value.length > maxlimit )    {
    field.value = field.value.substring( 0, maxlimit );
}else{
    countfield.value = maxlimit - field.value.length;
}

I'm not quite sure what you're asking, but you can easily use your own function in these event handlers like this:

$(document).ready( function(){
  $('#comments').bind('keydown keyup', function(){
    textCounter( ...etc... );
  });
});

Depending on what you're trying to do, you might have better luck with the keypress event instead:

  $('#comments').keypress( function(){...} );

Keypress has the advantages of being triggered for every character when a key is held down for auto-repeating, and not being triggered for keys like shift. With keydown and keyup you'll be running your function twice for each pressed key, which may not be what you want.

Update: If all you're looking to do is truncate and show the current count, why not make a simpler function, like this:

function textCounter( field, countfield, limit ){
  field.value = field.value.substring(0,limit); 
  countfield.val( limit-field.value.length );
}

And then:

$('#comments').keypress( function(){
  textCounter(this, $('#bar'), 240 );
});

Example: http://jsfiddle.net/redler/c5sUU/1/

yes inside the function textCounnter, add the function of the Jquery, triggering a function w/ in a function? but why do tou want the textCounter in javascript anyway?

why not do this

$(#comments){ ..textcounter ideas inside }