function validate_form() {
	// Global variables for shorthand use
	var email = document.esc_sign_up.email.value;
	
	if(email == "") {
		alert("Please enter a valid email address");
		document.esc_sign_up.email.focus();
		return(false);
	}

	else if(email.indexOf("@") < 1) {
		alert("Please enter a valid email address");
		document.esc_sign_up.email.focus();
		return(false);
	}
	
	else {
		return(true);
	}
}