function delall()
{
  if (document.forms[1].checkalldel.checked)
    {
        var count = document.forms[1].elements.length;
        for (i=1; i<count; i++)
        {
            if(document.forms[1].elements[i].disabled==false){document.forms[1].elements[i].checked=true}
        }
    }
  else
    {
       var count = document.forms[1].elements.length;
        for (i=1; i<count; i++)
        {
            document.forms[1].elements[i].checked=false
        }
    }
}