var form_total=0;
function CheckChoice(whichbox)
{
if (whichbox.checked == false)
{ form_total -= eval(whichbox.value); }
else 	{ form_total += eval(whichbox.value); }
document.tsquiz.total.value = eval(form_total);
}
function InitForm()
{
document.tsquiz.total.value='0';
for (xx=0; xx < document.tsquiz.elements.length; xx++)
{
if (document.tsquiz.elements[xx].type == 'checkbox')
{
document.tsquiz.elements[xx].checked = false;
}
}
}