function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);return false}
else {return true}
}
}

function validate_requiredCB(alerttxt)
{
if (document.app.wretake.checked==false && document.app.oretake.checked==false) 
		{alert(alerttxt);return false}
else {return true}
}

function validate_email(field,alerttxt)
{
with (field)
{
apos=value.indexOf("@")
dotpos=value.lastIndexOf(".")
if (apos<1||dotpos-apos<2) 
  {alert(alerttxt);return false}
else {return true}
}
}
function validate_form(thisform)
{
with (thisform)
{
if (validate_required(fullName,"Please enter your name")==false)
  {fullName.focus();return false};
if (validate_email(email,"Please enter a valid e-mail address")==false)
  {email.focus();return false};
if (validate_requiredCB("Please select a test to retake")==false)
  {wretake.focus();return false};
}
}

function clear_radio_buttons() {
     for (var i = 0; i < document.app.retakeloc.length; i++) {
          document.app.retakeloc[i].checked = false;
     }
}