// JScript File

    
// Removes leading whitespaces
function LTrim( value ) {
	var re = /\s*((\S+\s*)*)/;
	return value.replace(re, "$1");
}
// Removes ending whitespaces
function RTrim( value ) {
	var re = /((\s*\S+)*)\s*/;
	return value.replace(re, "$1");
}
// Removes leading and ending whitespaces
function trim( value ) {
	return LTrim(RTrim(value));
}


  //
  // FOR LUHN ALGORITHM TO VALIDATE CREDIT CARD.
  //
  function checkCC(s) {

  var i, n, c, r, t;
  // First, reverse the string and remove any non-numeric characters.

  r = "";
  for (i = 0; i < s.length; i++)
  {
     s=s.replace(" ","");
  }
  
  if (s.length==0)
        {        
        return false;
        }
        
  for (i = 0; i < s.length; i++)
  {
     s=s.replace("-","");
  }
  for (i = 0; i < s.length; i++) {
    c = parseInt(s.charAt(i), 10);
    if (c >= 0 && c <= 9)
      r = c + r;
  }
  
      
  // Check for a bad string.
  if ((r.length <=1) ||(s.length > r.length))
  {          
        return false; 
  }
  // Now run through each single digit to create a new string. Even digits
  // are multiplied by two, odd digits are left alone.

  t = "";
  for (i = 0; i < r.length; i++) {
    c = parseInt(r.charAt(i), 10);
    if (i % 2 != 0)
      c *= 2;
    t = t + c;
  }    
    
  // Finally, add up all the single digits in this string.

  n = 0;
  for (i = 0; i < t.length; i++) {
    c = parseInt(t.charAt(i), 10);
    n = n + c;
  } 
  

  // If the resulting sum is an even multiple of ten (but not zero), the
  // card number is good.
  if (n != 0 && n % 10 == 0)
    {          
        return true;
     } 
  else
    {        
        return false;
    }
}