Javascript object AppendChild not workig on Safari(Mac).

function appendVariantForms(frmCollectFrom,frmCollector)
{
//    alert('appendVariantForms');
    var frm = frmCollectFrom.elements;
    var elements = eval(frm.length);
    var ix = 0;
    var temp;
    for (;ix < elements;ix++)
    {
        try
        {
            temp = frm[ix].id;
            var obj = frm[ix];
    //        alert(obj.id.substr(0,2));
            if(obj.id.substr(0,2) != "x_")
            {
                frmCollector.appendChild(obj);
            }
        }
        catch(e)
        {
            elements = eval(frm.length);
            ix = 0;
        }
    }
    return frmCollector;
}