The Driver Insurance Abstract Service (DIAS) works just fine without having Javascript enabled, but it could take you longer to do your searches. With Javascript enabled, when you enter data that is not properly formatted (e.g. not enough characters for a given field), you will receive immediately a pop-up message indicating the data entry mistake. This gives you the chance to correct the mistake before submitting your search request. As an added benefit, it allows for colours to be properly displayed, which makes for a more æsthetically-pleasing interface.