/*-----------------------------------------------------------------
*******************************************************************
File: fcheck.js.js
Designed for: MU Dept. of Student Life
Author: Pettr Datsov
Email: p_datzov@yahoo.com
Created on: 3/23/2009
******************************************************************
----------------------------------------------------------------*/



//following function is for ListServ Subscribe Module
function checkFeedback() {


	
	if (document.feedback.randomno.value == "") {
		alert("You must enter the code.");
		return false;
	}
	
	 if (! isValidEmail(document.feedback.email.value)) {
        alert("Please enter a valid email address");
        return false;
	 }
	 // above loop calls the email validator function i.e. located in this file

return true;
}
//-------End checkFeedback



//-----Following code is for the email validator script above function will be calling for. 
// You should call this function inside another functions you would write to validate some forms

function isValidEmail(email, required) {
    if (required==undefined) {   // if not specified, assume it's required
        required=true;
    }
    if (email==null) {
        if (required) {
            return false;
        }
        return true;
    }
    if (email.length==0) {  
        if (required) {
            return false;
        }
        return true;
    }
    if (! allValidChars(email)) {  // check to make sure all characters are valid
        return false;
    }
    if (email.indexOf("@") < 1) { //  must contain @, and it must not be the first character
        return false;
    } else if (email.lastIndexOf(".") <= email.indexOf("@")) {  // last dot must be after the @
        return false;
    } else if (email.indexOf("@") == email.length) {  // @ must not be the last character
        return false;
    }
	
    return true;
}

function allValidChars(email) {
  var parsed = true;
  var validchars = "_abcdefghijklmnopqrstuvwxyz0123456789@.-";
  for (var i=0; i < email.length; i++) {
    var letter = email.charAt(i).toLowerCase();
    if (validchars.indexOf(letter) != -1)
      continue;
    parsed = false;
    break;
  }
  return parsed;
}
//end of email validator.