Submit form via ajax in ZOHO CRM

Submit form via ajax in ZOHO CRM

I have an issue, i am trying to send email with zoho crm 
  <form id='form' method="POST" action='https://crm.zoho.com/crm/WebToLeadForm' >

and want to sent email without page refresh via ajax..
Below is my code which i am using
<script type="text/javascript">

    $(document).ready(function () {
        var options = {
beforeSubmit: validate,
         success: showResponse

        };

        $('#form').ajaxForm(options);
    });

    function showResponse(responseText, statusText, xhr, $form) {
        $('#form').clearForm();
        alert(statusText);
    } 
function validate(formData, jqForm, options) { 
      var usernameValue = $('input[name=LastName]').fieldValue(); 
var EmailValue = $('input[name=Email]').fieldValue(); 
var CompanyValue = $('input[name=Company]').fieldValue(); 
var DescriptionValue = $('textarea[name=Description]').fieldValue(); 
if (usernameValue[0]=="" || EmailValue[0]=="" || CompanyValue[0]=="" || DescriptionValue[0]=="") { 
        alert("Please enter values"); 
        return false; 
    } 
// alert(EmailValue[0]); 
 
}
    </script>

Email is being sent successfully, but issue is that SUCCESS method is not been called for FORM submit..
can someone tell me what could be the issue.
Error in console is:
XMLHttpRequest cannot load https://crm.zoho.com/crm/WebToLeadForm . No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin ' http://www.websie.com ' is therefore not allowed access.

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