Евгений

var mysitekey = 'key';
		var gcaptcha = function() {
			$().ready(function() {
				$('.grecaptcha').each(function(index, element) {
					var id = $(this).attr('id');
					window['captcha_'+id] = grecaptcha.render(id, { 'sitekey' : mysitekey });	
				})
			});
		};

<script src="https://www.google.com/recaptcha/api.js?onload=gcaptcha&render=explicit"></script>