if(isJsEnabled())
{
    addLoadEvent(collapseAutoAttach);
}

function collapseAutoAttach(){
    var fieldsets = document.getElementsByTagName('fieldset');
    var legend, fieldset;

    for(var i = 0; fieldset = fieldsets[i]; i++)
    {
        if(!hasClass(fieldset, 'collapsible'))
        {
            continue;
        }

        legend = fieldset.getElementsByTagName('legend');

        if(legend.length == 0)
        {
            continue;
        }

        legend = legend[0];
        var a = document.createElement('a');
        a.href = '#';

        a.onclick = function(){
            toggleClass(this.parentNode.parentNode, 'collapsed');

            if(!hasClass(this.parentNode.parentNode, 'collapsed'))
            {
                collapseScrollIntoView(this.parentNode.parentNode);

                if(typeof textAreaAutoAttach != 'undefined')
                {
                    // Add the grippie to a textarea in a collapsed fieldset.
                    textAreaAutoAttach(null, this.parentNode.parentNode);
                }
            }

            this.blur();
            return false;
        };

        a.innerHTML = legend.innerHTML;

        while(legend.hasChildNodes())
        {
            removeNode(legend.childNodes[0]);
        }

        legend.appendChild(a);
        collapseEnsureErrorsVisible(fieldset);
    }
}

function collapseEnsureErrorsVisible(fieldset){
    if(!hasClass(fieldset, 'collapsed'))
    {
        return;
    }

    var inputs = [];
    inputs = inputs.concat(fieldset.getElementsByTagName('input'));
    inputs = inputs.concat(fieldset.getElementsByTagName('textarea'));
    inputs = inputs.concat(fieldset.getElementsByTagName('select'));

    for(var j = 0; j<3; j++)
    {
        for(var i = 0; i < inputs[j].length; i++)
        {
            if(hasClass(inputs[j][i], 'error'))
            {
                return removeClass(fieldset, 'collapsed');
            }
        }
    }
}

function collapseScrollIntoView(node){
    var h = self.innerHeight || document.documentElement.clientHeight || document.body.clientHeight || 0;
    var offset = self.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
    var pos = absolutePosition(node);

    if(pos.y + node.scrollHeight > h + offset)
    {
        if(node.scrollHeight > h)
        {
            window.scrollTo(0, pos.y);
        }
        else
        {
            window.scrollTo(0, pos.y + node.scrollHeight - h);
        }
    }
}