// JavaScript Document
function fieldError(err) {
	document.getElementById(err).style.display = 'inline';
}
function fieldCorrect(err) {
	document.getElementById(err).style.display = 'none';
}


function validateEmpty(fld, fldErr) {
    var error = "";
  
    if (fld.value.length == 0) {
        //fld.style.background = '#ffffcc';
		//Effect.Shake(fld);
		fieldError(fldErr);
		error = "The required field has not been filled in.\n"
    } else {
        fld.style.background = 'White';
		fieldCorrect(fldErr);
    }
    return error;   
}

function validateName(fld, fldErr) {
    var error = "";
  
    if (fld.value.length == 0) {
        //fld.style.background = '#ffffcc';
		//Effect.Shake(fld);
		fieldError(fldErr);
        error = "You didn't enter your name.\n"
    } else {
        fld.style.background = 'White';
		fieldCorrect(fldErr);
    }
    return error;   
}

function trim(s)
{
  return s.replace(/^\s+|\s+$/, '');
} 

function validateEmail(fld, fldErr) {
    var error="";
    var tfld = trim(fld.value);                        // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
    
    if (fld.value == "") {
		fieldError(fldErr);
        //fld.style.background = '#ffffcc';
		//Effect.Shake(fld);
        error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
		fieldError(fldErr);
        //fld.style.background = '#ffffcc';
		//Effect.Shake(fld);
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
		fieldError(fldErr);
        //fld.style.background = '#ffffcc';
		//Effect.Shake(fld);
        error = "The email address contains illegal characters.\n";
    } else {
        //fld.style.background = 'White';
		fieldCorrect(fldErr);
    }
    return error;
}

function validatePhone(fld, fldErr) {
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');     

   if (fld.value == "") {
        error = "You didn't enter a phone number.\n";
		//Effect.Shake(fld);
        //fld.style.background = '#ffffcc';
		fieldError(fldErr);

    } else if (isNaN(parseInt(stripped))) {
        error = "The phone number contains illegal characters.\n";
		//Effect.Shake(fld);
        //fld.style.background = '#ffffcc';
		fieldError(fldErr);

    } else if (!(stripped.length == 10)) {
        error = "The phone number is the wrong length. Make sure you included an area code.\n";
		//Effect.Shake(fld);
        //fld.style.background = '#ffffcc';
		fieldError(fldErr);

    } else {
		fieldCorrect(fldErr);
		}
    return error;
}