Remove the empty element from an array

// ---------------------------------------
//             Array.clean 
//           prototype function
// 
// by Davide Beltrame (Broly)
// e-mail: davb86@libero.it
// 
// This function remove the empty element 
// from an array
//
// Syntax
//
// arrayname.clean(to_delete)
//
// Parameter: to_delete <- element to delete from the array
// 
// ----------------------------------------
Array.prototype.clean = function(to_delete)
{
   var a;
   for (a = 0; a < this.length; a++)
   {
      if (this[a] == to_delete)
      {         
         this.splice(a, 1);
         a--;
      }
   }
   return this;
};
 
//Usage sample
arr= new Array("","Hello","Friend","", "Hello","","World")
trace("Original array: " + arr) //Trace original array
trace("Cleaned array: " + arr.clean("")) // Trace cleaned array (delete empty values)
//trace("Cleaned array : " + arr.clean("Hello")) 
// Trace cleaned array (delete "Hello" values)