function check_other(){
	var ret="";
	 var d = new Date($("#expiration_year").val(),$("#expiration_month").val()-1,1);
	 var today = new Date();
	 var d2 = new Date(today.getFullYear(),today.getMonth(),1);
	 if(d < d2)
		ret = "Check expiration date.<br>";
	
	var sType = check_card($("#card_number").val());
    if(sType != ""){
		$("#card_type").val(sType);
	}else
		ret = "Invalid credit card number.<br>";
	return ret;	
}

function check_card(ccnum){
    var cc_type="";
    var ccVisa = /^4\d{3}-?\d{4}-?\d{4}-?\d{4}$/;
    var ccMaster = /^5[1-5]\d{2}-?\d{4}-?\d{4}-?\d{4}$/;
    var ccDiscover = /^6011-?\d{4}-?\d{4}-?\d{4}$/;
    var ccAmex = /^3[4,7]\d{13}$/;
    if(ccVisa.test(ccnum))
        cc_type="visa";
    else if(ccMaster.test(ccnum))
        cc_type="mastercard";
    else if(ccDiscover.test(ccnum))
        cc_type="discover";
    else if(ccAmex.test(ccnum))
        cc_type="amex";
    else
        return cc_type;
        
    ccnum = ccnum.split("-").join("");
    // Checksum ("Mod 10")
    var checksum = 0;
    for (var i=(2-(ccnum.length % 2)); i<=ccnum.length; i+=2) 
    {
       checksum += parseInt(ccnum.charAt(i-1));
    }
    for (var i=(ccnum.length % 2) + 1; i<ccnum.length; i+=2) 
    {
       var digit = parseInt(ccnum.charAt(i-1)) * 2;
       if (digit < 10) 
       { 
     checksum += digit; 
       } 
       else 
       { 
     checksum += (digit-9); 
       }
    }
    return ((checksum % 10) == 0)?cc_type:"";
}


function isEmpty(str){
  return (str == null) || (str.length == 0);
}
// returns true if the string is a valid email
function isEmail(str){
  if(isEmpty(str)) return false;
  var re = /^[^\s()<>@,;:\/]+@\w[\w\.-]+\.[a-z]{2,}$/i
  return re.test(str);
}
// returns true if the string only contains characters A-Z or a-z
function isAlpha(str){
  var re = /[^a-zA-Z]/g
  if (re.test(str)) return false;
  return true;
}
// returns true if the string only contains characters 0-9
function isNumeric(str){
  var re = /[\D]/g
  if (re.test(str)) return false;
  return true;
}
// returns true if the string only contains characters A-Z, a-z or 0-9
function isAlphaNumeric(str){
  var re = /[^a-zA-Z0-9]/g
  if (re.test(str)) return false;
  return true;
}
// returns true if the string's length equals "len"
function isLength(str, len){
  return str.length == len;
}
// returns true if the string's length is between "min" and "max"
function isLengthBetween(str, min, max){
  return (str.length >= min)&&(str.length <= max);
}
// returns true if the string is a US phone number formatted as...
// (000)000-0000, (000) 000-0000, 000-000-0000, 000.000.0000, 000 000 0000, 0000000000
function isPhoneNumber(str){
  var re = /^\(?[2-9]\d{2}[\)\.-]?\s?\d{3}[\s\.-]?\d{4}$/
  return re.test(str);
}
// returns true if the string is a valid date formatted as...
// mm dd yyyy, mm/dd/yyyy, mm.dd.yyyy, mm-dd-yyyy
function isDate(str){
	if(str.indexOf("0") == 0)
		str = str.substring(1);
  var re = /^(\d{1,2})[\s\.\/-](\d{1,2})[\s\.\/-](\d{4})$/
  if (!re.test(str)) return false;
  var result = str.match(re);
  var m = parseInt(result[1]);
  var d = parseInt(result[2]);
  var y = parseInt(result[3]);
  if(m < 1 || m > 12 || y < 1900 || y > 2100) return false;
  if(m == 2){
          var days = ((y % 4) == 0) ? 29 : 28;
  }else if(m == 4 || m == 6 || m == 9 || m == 11){
          var days = 30;
  }else{
          var days = 31;
  }
  return (d >= 1 && d <= days);
}
// returns true if "str1" is the same as the "str2"
function isMatch(str1, str2){
  return str1 == str2;
}
// returns true if the string contains only whitespace
// cannot check a password type input for whitespace
function isWhitespace(str){ // NOT USED IN FORM VALIDATION
  var re = /[\S]/g
  if (re.test(str)) return false;
  return true;
}
// removes any whitespace from the string and returns the result
// the value of "replacement" will be used to replace the whitespace (optional)
function stripWhitespace(str, replacement){// NOT USED IN FORM VALIDATION
  if (replacement == null) replacement = '';
  var result = str;
  var re = /\s/g
  if(str.search(re) != -1){
    result = str.replace(re, replacement);
  }
  return result;
}
// validate the form
function validateForm(f){
  var errors = '';

  var i,e,t,n,v;
  for(i=0; i < f.elements.length; i++){
    e = f.elements[i];
    if(e.optional) continue;
    t = e.type;
	n = $(e).attr("title");
    //n = e.name;
    v = e.value;
    if(t == 'text' || t == 'password' || t == 'textarea'){
      if(isEmpty(v)){
        errors += n+' cannot be empty.<br>'; continue;
      }
      if(v == e.defaultValue){
        errors += n+' cannot use the default value.<br>'; continue;
      }
      if(e.isAlpha){
        if(!isAlpha(v)){
          errors += n+' can only contain characters A-Z a-z.<br>'; continue;
        }
      }
      if(e.isNumeric){
        if(!isNumeric(v)){
          errors += n+' can only contain characters 0-9.<br>'; continue;
        }
      }
      if(e.isAlphaNumeric){
        if(!isAlphaNumeric(v)){
          errors += n+' can only contain characters A-Z a-z 0-9.<br>'; continue;
        }
      }
      if(e.isEmail){
        if(!isEmail(v)){
          errors += v+' is not a valid email.<br>'; continue;
        }
      }
      if(e.isLength != null){
        var len = e.isLength;
        if(!isLength(v,len)){
          errors += n+' must contain only '+len+' characters.<br>'; continue;
        }
      }
      if(e.isLengthBetween != null){
        var min = e.isLengthBetween[0];
        var max = e.isLengthBetween[1];
        if(!isLengthBetween(v,min,max)){
          errors += n+' cannot contain less than '+min+' or more than '+max+' characters.<br>'; continue;
        }
      }
      if(e.isPhoneNumber){
        if(!isPhoneNumber(v)){
          errors += v+' is not a valid US phone number.<br>'; continue;
        }
      }
      if(e.isDate){
        if(!isDate(v)){
          errors += v+' is not a valid date.<br>'; continue;
        }
      }
      if(e.isMatch != null){
        if(!isMatch(v, e.isMatch)){
          errors += n+' does not match.<br>'; continue;
        }
      }
    }
    if(t.indexOf('select') != -1){
      if(isEmpty(e.options[e.selectedIndex].value)){
        errors += n+' needs an option selected.<br>'; continue;
      }
    }
    /*if(t == 'file'){
      if(isEmpty(v)){
        errors += n+' needs a file to upload.<br>'; continue;
      }
    }*/
  }
  //if(errors != '') alert(errors);
  return errors;
}