// check email
function checkEmailAddress (strng,errormsg) {
	var error="";
	var newstrng = trim(strng);
	var emailFilter=/^.+@.+\..{2,4}$/;
	var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
	// Just a double quote so the code below here has coloring applied properly"
		
	if (newstrng == "") {
		error = errormsg + "\n";
	} else if (!(emailFilter.test(newstrng))) { 
		error = "Please enter a valid email address.\n";
	} else {
		//test email for illegal characters
		if (newstrng.match(illegalChars)) {
			error = "The email address contains illegal characters.\n";
		}
	}
	return error;    
}

// non-empty textbox
function isEmpty(strng,errormsg) {
var error = "";
var newstrng = trim(strng);

  if ( (newstrng == "") || (newstrng.length == 0) ) {
     error = errormsg + "\n"
  }
return error;	  
}

//Function to Trim leading/trailing whitespace off string
function trim(stringToTrim) {
	return stringToTrim.replace(/^\s+|\s+$/g,"");
}

// valid selector from dropdown list
function checkDropdown(choice,errormsg) {
var error = "";
    if (choice == 0) {
    error = errormsg + "\n";
    }    
return error;
}

function inValidCharSet(str,charset,errormsg) {
  var error = "";
  // Note: doesn't use regular expressions to avoid early Mac browser bugs
  for (var i=0;i<str.length;i++)
    if (charset.indexOf(str.substr(i,1))<0) {
      error = errormsg + "\n";
      break;
    }
  return error;
}

function onlyDigits(str,errormsg) { 
  return inValidCharSet(str,"0123456789",errormsg);
}






// validate that at least one box is checked
function validateCheckboxes(field1,field2,field3,field4,field5,field6,errormsg) {
  var error = "";
  
  if (field1||field2||field3||field4||field5||field6){
  	error = "";
	}
	else{
	error = errormsg + "\n";
  	}
return error;
}

// check email
function checkEmail (strng) {
var error="";
if (strng == "") {
   error = "You didn't enter an email address.\n";
}

    var emailFilter=/^.+@.+\..{2,3}$/;
    if (!(emailFilter.test(strng))) { 
       error = "Please enter a valid email address.\n";
    }
    else {
//test email for illegal characters
       var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
         if (strng.match(illegalChars)) {
          error = "The email address contains illegal characters.\n";
       }
    }
return error;    
}

// confirm that the confirm email field matches the email field
function confirmEmail(field1,field2,errormsg) {
  var error = "";
  
  if (field1== field2){
  	error = "";
	}
	else{
	error = errormsg + "\n";
  	}
return error;
}

// phone number - strip out delimiters and check for 10 digits
function checkPhone (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a phone number.\n";
}
var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
    if (isNaN(parseInt(stripped))) {
       error = "The phone number contains illegal characters.";
  
    }
    if (!(stripped.length == 10)) {
	error = "The phone number is the wrong length. Make sure you included an area code.\n";
    } 
return error;
}

// password - between 6-8 chars, uppercase, lowercase, and numeral
function checkPassword (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a password.\n";
}
    var illegalChars = /[\W_]/; // allow only letters and numbers
    
    if ((strng.length < 6) || (strng.length > 8)) {
       error = "The password is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
      error = "The password contains illegal characters.\n";
    } 
    else if (!((strng.search(/(a-z)+/)) && (strng.search(/(A-Z)+/)) && (strng.search(/(0-9)+/)))) {
       error = "The password must contain at least one uppercase letter, one lowercase letter, and one numeral.\n";
    }  
return error;    
}    


// username - 4-10 chars, uc, lc, and underscore only.
function checkUsername (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a username.\n";
}
    var illegalChars = /\W/; // allow letters, numbers, and underscores
    if ((strng.length < 4) || (strng.length > 10)) {
       error = "The username is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
    error = "The username contains illegal characters.\n";
    } 
return error;
}       


// was textbox altered

function isDifferent(strng) {
var error = ""; 
  if (strng != "Can\'t touch this!") {
     error = "You altered the inviolate text area.\n";
  }
return error;
}

// exactly one radio button is chosen

function checkRadio(checkvalue) {
var error = "";
   if (!(checkvalue)) {
       error = "Please check a radio button.\n";
    }
return error;
}