function check_statistics_single()
{
   var cval = window.document.statistics_machinelist.machine_id;
   
   if(trim(cval.value) == '')
   {
      alert('You did not check off any machines');
      cval.focus();
      return false;
   }
   else
   {
      return true;
   }
}

function trim(str)
{
   return str.replace(/^\s+|\s+$/g,'');
}

function check_statistics_double()
{
   var cval = window.document.statistics_machinelist.machine_id;
   
   if(trim(cval.value) == '')
   {
      alert('You did not check off any machines');
      cval.focus();
      return false;
   }
   else
   {
      return true;
   }
}

function trim(str)
{
   return str.replace(/^\s+|\s+$/g,'');
}

function checkCheckBoxes()
{
	if (document.checkboxes.machine_id.checked == false)
	{
		alert('You didn\'t choose any of the checkboxes!');
		return false;
	}
	else
	{
		return true;
	}
}