jQuery(".numeric_filter").keydown(function(event) {
            // Allow: backspace, delete, tab, escape, enter and .
            if ( jQuery.inArray(event.keyCode,[46,8,9,27,13,190]) !== -1 ||
                 // Allow: Ctrl+A
                (event.keyCode == 65 && event.ctrlKey === true) || 
                 // Allow: home, end, left, right
                (event.keyCode >= 35 && event.keyCode <= 39)) {
                     // let it happen, don't do anything
                     return;
            }
            else {
                // Ensure that it is a number and stop the keypress
                if (event.shiftKey || (event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105 )) {
                    event.preventDefault(); 
                }   
            }
        });