What I want to do is "ones a user is finished typing his/her e-mail and has moved to password field or just finished typing e-mail, to have jquery load the users gravatar based on the e-mail that was inserted on the login page and load this image into the div that contains temporary no-image image."
How can I do this with jQuery
No HTML given
<input id="email" ... /><img id="gravatar" style="display:none;"/>
It doesn't need ajax as someone suggested because the gravatar call is very simple.
jQuery
$('#email').on('change', function(){
var hash=md5($('#email').val()); // you will need to find a javascript md5 function
$('#gravatar').attr('src', 'http://www.gravatar.com/avatar/' + hash).show();
});
I haven't bothered to preload the image.
"or just finished typing e-mail" - if you want to do this you would throw in an email address validation function and check on keyup too.
$('#email').on('keyup change', function(){
if (is_email_address($(this).val()){
var hash=md5($('#email').val()); // you will need to find a javascript md5 function
$('#gravatar').attr('src', 'http://www.gravatar.com/avatar/' + hash).show();
}
});