function checkAll(field)
{
  for(i = 0; i < field.elements.length; i++)
     field[i].checked = true ;
}

function uncheckAll(field)
{
 for(i = 0; i < field.elements.length; i++)
    field[i].checked = false ;
}

function Confirm(link,text) 
{
  if (confirm(text))
     window.location=link
}