function ValidateData() {

//Submission variable
var CanSubmit = false;

//Check to make sure that the worksheet title field is not empty.
CanSubmit = ForceEntry("WorksheetTitle", "Please enter a title for the worksheet.");
if (!CanSubmit) return;

// check numeric entries are numeric 
CanSubmit = ForceNumber("QuestionCount", "Number of questions");
if (!CanSubmit) return;

// check question range
if (parseInt(document.getElementById("QuestionCount").value) < 1 || parseInt(document.getElementById("QuestionCount").value) > 99)  
  { 
  alert ("Please enter a value in the 'number of questions' box between 1 and 99."); 
  CanSubmit = false;
  return; 
  } 

// check that one of the time types has been entered (eg. must be generating at least one type of time,
// such as o'clock, qtr past, half past, qtr to, 5 min intervals or any time.  Otherwise - what would go
//on the worksheet?

if (
	(!document.getElementById("OClock").checked) &&
	(!document.getElementById("QtrPast").checked) &&
	(!document.getElementById("HalfPast").checked) &&
	(!document.getElementById("QtrTo").checked) &&
	(!document.getElementById("5Min").checked) &&
	(!document.getElementById("AnyTime").checked)
	) 
	{
		alert("Please tick at least one of the 'times to generate' boxes.");
		CanSubmit = false;
		return;
	}


//If fields have been entered correctly, submit the form
if (CanSubmit) document.LayoutTime.submit();

} //end function