Updated Script

<script type="text/javascript">
            //<![CDATA[
        var submitcount49502 = 0;

function isValidEmailAddress(emailAddress) {
    var pattern = new RegExp(/^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$/i);
    return pattern.test(emailAddress);
};

$("#catwebformbutton").click(function(e) {
	e.preventDefault();
	var className = $(this).attr("requiredclass");
	var emailClass = $(this).attr("emailclass");
	var formId = $(this).attr("formid");
	var hasRadios = $(this).attr("radios");
	var errors = 0;

	if (hasRadios == "yes") {
		var radios = Array(
			"CAT_Custom_300228",
			"CAT_Custom_300218",
			"CAT_Custom_300231",
			"CAT_Custom_300232",
			"CAT_Custom_300233",
			"CAT_Custom_300234",
			"CAT_Custom_300237",
			"CAT_Custom_300243"
		);

		for (var i=0; i<radios.length; i++) {
			var radioGroup = radios[i];
			var radioField = $("input[name=" + radioGroup + "]");
			if (!radioField.filter(':checked').val()) {
				$("#label_" + radioGroup).addClass('redText');
				errors++;
			} else {
				$("#label_" + radioGroup).removeClass('redText');
			}
		}

	    $("." + className).each(function() {
	    	if(!$(this).val()) {
	    		$(this).addClass("invalid");
	    		$(this).prev().prev().addClass("redText");
	    		errors++;
	    	} else {
	    		$(this).removeClass("invalid");
	    		$(this).prev().prev().removeClass("redText");
	    	}
	    });
	}


	if (!$("." + emailClass).val() || !isValidEmailAddress($("." + emailClass).val())) {
            $("." + emailClass).addClass("invalid");
            $("." + emailClass).prev().prev().addClass("redText");
            errors++;
	} else {
		$("." + emailClass).removeClass("invalid");
		$("." + emailClass).prev().prev().removeClass("redText");
	}

	if (errors > 0) return false;
	if (submitcount49502 == 0) {
        submitcount49502 ++;
        $("#" + formId).submit();
        return false;
	} else {
    	alert("Form submission is in progress.");
    	return false;
	}

});
        //]]>
    </script>