// Limited Selection Checkbox Groups
// copyright Stephen Chapman, 26th July 2005
// you may copy this function provided that you retain the copyright notice
function boxchk(obj,max) {
			var box = obj.name.substr(0,obj.name.lastIndexOf('_')+1);
			var cnt=0, i=1;
			
			while(obj.form[box+i]) {
				cnt += obj.form[box+i].checked;
				i++;
				}

			if (cnt > max) {
				obj.checked = false;
				alert('Only choose ' + max + ' checkboxes.\nTo pick this option unselect one of the others.');
				}else if(cnt < max){			
			alert('You must agrees to provide at least two of the following');
			return false;
			
		}
		
	}