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

function validateEmpty(fld, errmsg) {
    var error = "";
    var tfld = trim(fld.value); 
 
    if (tfld.length < 2) {
        fld.style.background = 'Yellow';      
        error = errmsg;
    } else {
        fld.style.background = 'White';
    }
    return error;  
}

function validateUsername(fld) {
    var error = "";
    var illegalChars = /\W/; 
 
    if (fld.value == "") {
        fld.style.background = 'Yellow'; 
        error = "You didn't enter a username.\n";
    } else if ((fld.value.length < 5) || (fld.value.length > 15)) {
        fld.style.background = 'Yellow'; 
        error = "The username is the wrong length.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'Yellow'; 
        error = "The username contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}

function validatePassword(fld) {
    var error = "";
    var illegalChars = /[\W_]/;  
 
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter a password.\n";
    } else if ((fld.value.length < 7) || (fld.value.length > 15)) {
        error = "The password is the wrong length. \n";
        fld.style.background = 'Yellow';
    } else if (illegalChars.test(fld.value)) {
        error = "The password contains illegal characters.\n";
        fld.style.background = 'Yellow';
    } else if (!((fld.value.search(/(a-z)+/)) && (fld.value.search(/(0-9)+/)))) {
        error = "The password must contain at least one numeral.\n";
        fld.style.background = 'Yellow';
    } else {
        fld.style.background = 'White';
    }
   return error;
}   

function validateEmail2(fld) {
    var error="";
    var tfld = trim(fld.value);  
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
   
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {     
        fld.style.background = 'Yellow';
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'Yellow';
        error = "The email address contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}

function validateEmail(fld) {
    var error="";
    apos=fld.value.indexOf("@");
    dotpos=fld.value.lastIndexOf(".");
    if (apos<1||dotpos-apos<2) {
        error = "Please enter a valid email address.\n";
        fld.style.background = 'Yellow';
    } else {
        fld.style.background = 'White';     
    }
    return error;
}

function validateDropdown(fld, errmsg) {
    var error="";
    if ( fld.selectedIndex == 0 ) {
        fld.style.background = 'Yellow';
        error = errmsg;
    } else {
        fld.style.background = 'White';    
    }
    return error;
}

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

   if (fld.value == "") {
        error = "You didn't enter a phone number.\n";
        fld.style.background = 'Yellow';
    } else if (isNaN(parseInt(stripped))) {
        error = "The phone number contains illegal characters.\n";
        fld.style.background = 'Yellow';
    } else if (!(stripped.length == 10)) {
        error = "The phone number is the wrong length. Make sure you included an area code.\n";
        fld.style.background = 'Yellow';
    }
    return error;
}

function validateCheckboxes(frm, errmsg) {
    var error = "";
    var total=0;
    for (i = 0; i < frm.elements.length; i++) {
        if (frm.elements[i].type == "checkbox") {
            if (frm.elements[i].checked) {
                total++;
            } 
        }
    }
    if( total == 0 ) {
        error = errmsg;
    }
    return error;
}
function validateRadio(frm, errmsg) {
    var error = "";
    var isOneChecked = false;
    //alert("city len=" + frm.city.length);
    for (var i=0; i < frm.city.length; i++) {
         if(frm.city[i].checked){
            isOneChecked = true;
            break;
         }
    }

    if (!isOneChecked) {
        error = errmsg;
    }
    return error;
}