Javascript: zerofill function

function zeroFill( number, width )

{

  width -= number.toString().length;

  if ( width > 0 )

  {

    return new Array( width + (/\./.test( number ) ? 2 : 1) ).join( '0' ) + number;

  }

  return number + ""; // always return a string

}

Resource:

http://stackoverflow.com/questions/1267283/how-can-i-create-a-zerofilled-value-using-javascript