function rechne(form) {
cr			= eval(form.cr.value)
par			= eval(form.par.value)
exact		= eval(form.exact.value)
abschlag	= eval(form.abschlag.value)
strokes		= eval(form.strokes.value)
playing		= Math.round(exact*(abschlag/113)+(cr-par))
form.playing.value = playing
stfd		= 36+((par+playing)-(strokes));
form.stfd.value = stfd
diff		= stfd-36;
form.diff.value = diff
}