//You should create the validator only after the definition of the HTML form
  var frmvalidator  = new Validator("datasheetForm");
  
	frmvalidator.addValidation("name","req","Please enter your Name");
	frmvalidator.addValidation("name","maxlen=28");

  
	frmvalidator.addValidation("myEmail","maxlen=50","Please enter your Email Address");
	frmvalidator.addValidation("myEmail","req");
	frmvalidator.addValidation("myEmail","email");
	
	var cnt = 0;
	var checkboxes = document.getElementsByTagName('input');
	for (var z in checkboxes) {
		if (checkboxes[z].type=='checkbox') {
			cnt +=1;
		}
	}
	
	for (var z in checkboxes) {
		if (checkboxes[z].type=='checkbox') {
			frmvalidator.addValidation(checkboxes[z].name,"atListOneCheckbox="+cnt,"Please select at least one checkbox.");
		}
	}