$(document).ready(function() {

    $('.orange_button_pre').each(function(index) {
        text = $(this).attr('value');
        buttonId = $(this).attr('id');
        anchorButton = $('<a href="#" class="orange_button" id="' + buttonId + '">' + text + '</a>');

        anchorButton.click(function() {
            $(this).parent()[0].submit();
            return false;
        });

        $(this).replaceWith(anchorButton);

        $('input').each(function(index) {
            $(this).keydown(function(e) {
                onFormKeyDown($(this), e);
            });
        });
        
        $('select').each(function(index) {
            $(this).keydown(function(e) {
                onFormKeyDown($(this), e);
            });
        });      
    });
});

function onFormKeyDown(field, event) {
    if (event.which == 13){
        $('form')[0].submit();
    }
}