function resetField(fieldname) {
  if (fieldname.value=="") { fieldname.value = fieldname.defaultValue }
}
function AddTours(a,c)
{
var adult = a;
var child = c;
form1.tadult.value = "$" + (parseFloat(form1.numadult.value)*a);
form1.tchild.value = "$" + (parseFloat(form1.numchild.value)*c);
form1.t.value = "$" + ((parseFloat(form1.numadult.value)*a + (parseFloat(form1.numchild.value)*c)));
}