function fileCheck() {
extent = document.form.attachfile.value.slice(-4);
	if (extent == "")
	return true

	if (extent == ".STL")
	return true

	if (extent != ".stl") {
		window.open('upload/restricted.htm','errorWindow','width=300,height=150,top=50,left=100');
//		alert("You have attached a file that is not in .STL format.  Your request has not been sent. Please try again.");
		return false;
	}
	return true
}