Index: misc/tabledrag.js
===================================================================
RCS file: /cvs/drupal/drupal/misc/tabledrag.js,v
retrieving revision 1.32
diff -r1.32 tabledrag.js
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<   // Hide columns containing affected form elements.
<   this.hideColumns();
---
>   // Hide or show weight and parent columns according to user preference.
>   // This aids screenreader accessibility so users can enter weight values.
>   // Initialize the weight columns for the show/hide toggle.
>   self.initColumns();
>   // Add a link before the table for users to show or hide weight columns.
>   $(table).before($('<a href="#" class="tabledrag-show-weight"></a>')
>     .append(Drupal.t('Show/hide weight fields'))
>     .click(function () { self.toggleShowWeight(self); return false; })
>   );
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<  * Hide the columns containing form elements according to the settings for
<  * this tableDrag instance.
---
>  * Initialize weight/parent columns to be hidden. Identify and mark each cell
>  * with a CSS class so we can easily toggle show/hide it. Finally, hide
>  * columns if user does not have a 'showWeight' cookie.
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< Drupal.tableDrag.prototype.hideColumns = function () {
---
> Drupal.tableDrag.prototype.initColumns = function () {
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<     // Hide the column containing this field.
<     if (hidden && cell[0] && cell.css('display') != 'none') {
---
>     // Mark the column containing this field so it can be hidden.
>     if (hidden && cell[0]) {
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<             // If this cell has a colspan, simply reduce it.
<             cell[0].colSpan = cell[0].colSpan - 1;
---
>             // If this cell has a colspan, mark it so we can reduce the colspan.
>             $(cell[0]).addClass('tabledrag-reduce-colspan');
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<             // Hide table body cells, but remove table header cells entirely
<             // (Safari doesn't hide properly).
<             parentTag == 'thead' ? cell.remove() : cell.css('display', 'none');
---
>             // Mark this cell so we can hide it.
> 	    $(cell[0]).addClass('tabledrag-display-none');
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>   // Now hide cells and reduce colspans unless user cookie is set.
>   var show = $.cookie('Drupal.tableDrag.showWeight');
>   if (show != 1) {
>     Drupal.tableDrag.prototype.hideColumns();
>   }
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>  * Hide the columns containing weight/parent form elements.
>  * Undo showColumns().
>  */
> Drupal.tableDrag.prototype.hideColumns = function () {
>   // Turn off display of weight/parent cells and headers.
>   $('.tabledrag-display-none').css('display', 'none');
>   // Reduce colspan of any effected multi-span columns.
>   $('.tabledrag-reduce-colspan').each(function() { this.colSpan = this.colSpan - 1; });
> }
> 
> /**
>  * Show the columns containing weight/parent form elements
>  * Undo hideColumns().
>  */
> Drupal.tableDrag.prototype.showColumns = function () {
>   // Increase colspan back to columns it was reduced.
>   $('.tabledrag-reduce-colspan').each(function() { this.colSpan = this.colSpan + 1; });
>   // Turn on display of weight/parent cells and headers.
>   $('.tabledrag-display-none').css('display', 'table-cell');
> }
> 
> /**
>  * Toggle visibility of weight/parent columns. Use a saved cookie to store the
>  * user preference.
>  */
> Drupal.tableDrag.prototype.toggleShowWeight = function (self) {
>   // Retrieve the tableDrag status from a stored cookie.
>   var show = $.cookie('Drupal.tableDrag.showWeight');
> 
>   // Show or hide columns with weight fields and toggle the cookie value.
>   if (show == 1) {
>     $.cookie(
>       'Drupal.tableDrag.showWeight',
>       0,
>       {
>         path: Drupal.settings.basePath,
>         // The cookie should "never" expire.
>         expires: 36500,
>       }
>     );
>     this.hideColumns();
>   }
>   else {
>     $.cookie(
>       'Drupal.tableDrag.showWeight',
>       1,
>       {
>         path: Drupal.settings.basePath,
>         // The cookie should "never" expire.
>         expires: 36500,
>       }
>     );
>     this.showColumns();
>   }
> }
> 
> /**
Index: modules/system/system.css
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.css,v
retrieving revision 1.68
diff -r1.68 system.css
690a691,708
> 
> /**
>  * Hide the tabledrag enable/disable link to everyone but screen readers and 
>  * keyboard only users.
>  */
> a.tabledrag-show-weight
> {
>   height: 0;
>   overflow: hidden;
>   position: absolute;
> }
> 
> a.tabledrag-show-weight:focus, a.tabledrag-show-weight:active
> {
>   height: auto;
>   overflow: visible;
>   top:30px;
> }