function trimTxt(s) {
while (s.substring(0,1) == ' ') {
s = s.substring(1,s.length);
}
while (s.substring(s.length-1,s.length) == ' ') {
s = s.substring(0,s.length-1);
}
return s;
}

function get_radio_value(formName, radioName){
for (var iu=0; iu < document.forms[formName].elements[radioName].length; iu++)
{
if (document.forms[formName].elements[radioName][iu].checked) {
return document.forms[formName].elements[radioName][iu].value;
}
}
return false;
}


function validateRadioButton(formName, radioName) {
var ff=document.forms[formName];
// validate myradiobuttons
var myOption = -1; var myVal=0;
for (ii=ff.elements[radioName].length-1; ii > -1; ii--) {
if (ff.elements[radioName][ii].checked) {
myOption = ii; ii = -1;
}
}
if (myOption == -1) return false;
else return true;
}

function formAlert(formName, jsWarning, fieldName, fieldTitle, focusField){
alert(jsWarning + fieldTitle);
if(focusField) document.forms[formName].elements[fieldName].focus();
return;
}

function reportDiv(txt){
document.getElementById('reportdiv').innerHTML=txt;
}

function validateFields(formName, thisBtn){

var ff=document.forms[formName];

var formOk=true;

//array of string type fields. Specify 'field_name' => 'Field Title'
var validatedStrings = {'name':'Name','email':'E-mail address','subject':'Subject','question':'Question or comments'};
//validation for a certain length of the strings; definitions should be described in 'validatedStrings' as well
var validatedStringsLength = {};
//validation of the integer value of the (dropdowns) which can't be zero
var validatedIntegers = {};
//validation of the radio buttons
var validatedRadios = {};
//validate strings
for (i in validatedStrings) {
if(!ff.elements[i] || trimTxt(ff.elements[i].value)=='') { formOk=false; formAlert(formName, 'Please, specify a valid value for the field ', i, validatedStrings[i], true); break; }
}

if(formOk) {

//validate strings length
var chkf;
for (i in validatedStringsLength) {
if(ff.elements[i]) chkf=trimTxt(ff.elements[i].value); else chkf='';
if(!ff.elements[i] || chkf.length<validatedStringsLength[i]) { formOk=false; formAlert(formName, 'Please, specify a valid value for the field ', i, validatedStrings[i], true); break; }
}

}

if(formOk) {

//validate integers
for (i in validatedIntegers) {
if(!ff.elements[i] || ff.elements[i].value==0) { formOk=false; formAlert(formName, 'Please, specify a valid value for the field ', i, validatedIntegers[i], true); break; }
}

}

if(formOk) {

//validate radios
for (i in validatedRadios) {
if(!validateRadioButton(formName, i)) { formOk=false; formAlert(formName, 'Please, specify a valid value for the field ', i, validatedRadios[i], false); break; }
}

}


if(formOk) {
//turing
if(!ff.elements['turing'] || trimTxt(ff.elements['turing'].value)==''){
formOk=false; formAlert(formName, 'Please, specify a valid value for the field ', 'turing', 'Robotshit check code', true);
}
}

//end of validation - proceeding to the Captcha check submission...

if(!formOk) return;
else {
//submit iframe form
reportDiv('Please wait, verifying the form...');
document.forms['checkform'].elements['turing'].value=document.forms['signupform'].elements['turing'].value;
document.forms['checkform'].elements['pg'].value=document.forms['signupform'].elements['pg'].value;
thisBtn.disabled=true;
document.forms['checkform'].submit();
}

}

function resetTuringNum(rest){
var randnm=Math.random();
document.turingimg.src='./form_captcha_gen.php?changeTuringNumber=1&rnd='+randnm;
document.forms['signupform'].elements['subbut'].disabled=false;
}

function submitForm(formName){
document.forms['signupform'].submit();
}