$(function(){
    var tabindex = 1;
    $('input,select').each(function() {
        if (this.type != "hidden") {
            var $input = $(this);
            $input.attr("tabindex", tabindex);
            tabindex++;
        }
    });
});

http://greatwebguy.com/programming/dom/setting-your-tabindex-on-your-html-forms-automatically-with-jquery/

This will reset the tabindex of all input fields on a form after page load

Reset tabindex on pageload

javascript, jquery

JavaScript