function DoCustomValidation() {


		var frm = document.forms["trial_form"];

		if (!frm.agreement.checked) {
			alert ("Please acknowledge the terms and conditions by clicking the checkbox.");
			return false;		
		}		
	
		return true;
	}

var orderValidator = new Validator("trial_form");

orderValidator.addValidation("Name","req","Please enter your name.");
orderValidator.addValidation("Email","req","Please enter your email address.");
orderValidator.addValidation("Telephone","req","Please enter a phone number.");
orderValidator.addValidation("CallDay","req","Please enter the best day to call.");

orderValidator.setAddnlValidationFunction("DoCustomValidation");