var model1= new Object; function Calculator_model1(){
var a = eval(theForm.a.value);
var b = eval(theForm.b.value);
var c = eval(theForm.c.value);
var extra = eval(theForm.extra.value);
theForm.subinhoud.value =  Math.round((a * b * c) * 100) / 100;
var subinhoud = eval(theForm.subinhoud.value);
theForm.inhoud.value =  Math.round((subinhoud + extra) * 100) / 100;
}
var model2= new Object; function Calculator_model2(){
var a = eval(theForm.a.value);
var b = eval(theForm.b.value);
var c = eval(theForm.c.value);
var d = eval(theForm.d.value);
var extra = eval(theForm.extra.value);
theForm.subinhoud.value = Math.round(((a * b * c) + (a * b * d / 2)) * 100) / 100;
var subinhoud = eval(theForm.subinhoud.value);
theForm.inhoud.value =  Math.round((subinhoud + extra) * 100) / 100;
}
var model3= new Object; function Calculator_model3(){
var a = eval(theForm.a.value);
var b = eval(theForm.b.value);
var c = eval(theForm.c.value);
var d = eval(theForm.d.value);
var extra = eval(theForm.extra.value);
theForm.subinhoud.value = Math.round(((a * b * c) + (a * b * d / 2)) * 100) / 100;
var subinhoud = eval(theForm.subinhoud.value);
theForm.inhoud.value =  Math.round((subinhoud + extra) * 100) / 100;
}
var model4= new Object; function Calculator_model4(){
var a = eval(theForm.a.value);
var b = eval(theForm.b.value);
var c = eval(theForm.c.value);
var d = eval(theForm.d.value);
var e = eval(theForm.e.value);
var f = eval(theForm.f.value);
var g = eval(theForm.g.value);
var extra = eval(theForm.extra.value);
theForm.subinhoud.value = Math.round(((a * b * (c + f / 2)) + (d * b * (e + g / 2))) * 100) / 100;
var subinhoud = eval(theForm.subinhoud.value);
theForm.inhoud.value =  Math.round((subinhoud + extra) * 100) / 100;
}
var model5= new Object; function Calculator_model5(){
var a = eval(theForm.a.value);
var b = eval(theForm.b.value);
var c = eval(theForm.c.value);
var d = eval(theForm.d.value);
var extra = eval(theForm.extra.value);
theForm.subinhoud.value = Math.round((a * b * (c + d / 3)) * 100) / 100;
var subinhoud = eval(theForm.subinhoud.value);
theForm.inhoud.value =  Math.round((subinhoud + extra) * 100) / 100;
}
var model6= new Object; function Calculator_model6(){
var a = eval(theForm.a.value);
var b = eval(theForm.b.value);
var c = eval(theForm.c.value);
var d = eval(theForm.d.value);
var e = eval(theForm.e.value);
var f = eval(theForm.f.value);
var extra = eval(theForm.extra.value);
theForm.subinhoud.value = Math.round(((a * (b + c + d) * e) + (a * b * f / 2) + (a * (c + d) * f / 3)) * 100) / 100;
var subinhoud = eval(theForm.subinhoud.value);
theForm.inhoud.value =  Math.round((subinhoud + extra) * 100) / 100;
}
var model7= new Object; function Calculator_model7(){
var a = eval(theForm.a.value);
var b = eval(theForm.b.value);
var c = eval(theForm.c.value);
var d = eval(theForm.d.value);
var e = eval(theForm.e.value);
var f = eval(theForm.f.value);
var extra = eval(theForm.extra.value);
theForm.subinhoud.value = Math.round(((a * b * c) + (b * (a + f) / 2 * d) + (b * e / 2 * f)) * 100) / 100;
var subinhoud = eval(theForm.subinhoud.value);
theForm.inhoud.value =  Math.round((subinhoud + extra) * 100) / 100;
}