function checkEmail(email_field) {

	var email = email_field.value.split(';');

	for (var i = 0; i < email.length; i++) {
		if (!validateEmail(email[i])) {
			return false;
		}
	}

	return true;
} 

function validateEmail(sEmail) {

	var validate = true;
	
	// validate submission
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/.test(sEmail) == false) validate = false;
	
	if(validate == false) {
		return false;
	}
	else
		return true;

}