var catCount=0
	var maxCat=4
	function checkCat(form)
	{
		catCount = 0;
		for (counter = 0; counter < form.CID.length; counter++)
		{
			if (form.CID[counter].checked)
			{
				catCount = catCount + 1;
			}
		}
		
		if (catCount > maxCat)
  		{
		  	alert('Please limit your selection to '+maxCat+' categories or less.')
		  	return false;
  		}
  		else
  		{
  			return true;
  		}
	}