function chgstate(box)
	{
	var boxclass = eval("document.getElementById('"+box+"').style.display");
	if(boxclass == 'none')
		{
		document.getElementById(box).style.display = 'block';
		}
	else
		{
		document.getElementById(box).style.display = 'none';
		}
	}
	
function chkForm()
    {
    var errors = "";
    if (document.getElementById('clinicForm').clinicid.value == "")
        {
        errors = errors + "Clinic\n";
        }
    if (document.getElementById('clinicForm').patientid.value == "ie. NSC000000 (the bar-coded sticker)")
        {
        errors = errors + "Test Number\n";
        }
    if (document.getElementById('clinicForm').postcode.value == "ie. ST1 1HR")
        {
        errors = errors + "Postcode\n";
        }
     if (errors == "")
        {
        document.getElementById('clinicForm').submit();
        }
    else
        {
      var msg = "Please enter the following missing information:\n\n" + errors;
      alert (msg);
        }
    }

function chkform2()
	{
	var errors = "";
    if (document.getElementById('clinicForm').postcode.value.length < 5 || document.getElementById('clinicForm').postcode.value.length > 8)
        {
        errors = errors + "The postcode you entered is not in the correct format. eg. ST1 1HR\n";
        }
	if (document.getElementById('clinicForm').postcode.value == "")
        {
        errors = errors + "Postcode information missing\n";
        }
	if(document.getElementById('clinicForm').type.value == "")
		{
		errors = errors + "Please select the clinic type you require";
		}
     if (errors == "")
        {
        document.getElementById('clinicForm').submit();
        }
    else
        {
      	alert (errors);
        }
	}
	
function launchCenter(url, name, width, height)
	{
	var str = "height=" + height + ",innerHeight=" + height;
	str += ",width=" + width + ",innerWidth=" + width;
	str += ",location=no, menubar=no, status=no, toolbar=no, scrollbars=no, resizable=no";
	if (window.screen)
		{
		var ah = screen.availHeight;
		var aw = screen.availWidth;
		
		var xc = (aw - width) / 2;
		var yc = (ah - height) / 2+10;
		
		str += ",left=" + xc + ",screenX=" + xc;
		str += ",top=" + yc + ",screenY=" + yc;
		}
	return window.open(url, name, str);
	}