function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);return false;}
else {return true}
}
}

function validate_form(thisform)
{
with (thisform)
{
if (validate_required(q,"Please enter a keyword(s) to perform a search on this site.")==false)
  {q.focus();return false;}
}
}