<!-- Begin
function CalcGeneral() {
origvol = (document.ConcreteGenCal.origvol.value);

document.ConcreteGenCal.cemwei.value = Math.round((origvol*5.76)*1000)/1000;
document.ConcreteGenCal.sandvol.value = Math.round((origvol*0.653)*100)/100;
document.ConcreteGenCal.sandwei.value = Math.round((origvol*16.325)*1000)/1000;
document.ConcreteGenCal.gravvol.value = Math.round((origvol*0.914)*100)/100;
document.ConcreteGenCal.gravwei.value = Math.round((origvol*21.475)*1000)/1000;
document.ConcreteGenCal.ballvol.value = Math.round((origvol*1.3)*100)/100;
document.ConcreteGenCal.ballwei.value = Math.round((origvol*32.5)*1000)/1000;
textmessage = 'With this volume of concrete, you should consider using readymix ';
if (origvol <= 1.5){textmessage = 'You could mix this quantity on site but a cement mixer would make it easier.';}
if (origvol <= 0.5){textmessage = 'It is probably easier to mix this quantity by hand.';}
document.ConcreteGenCal.Message.value = textmessage;}

function CalcPaving() {
origvol = (document.ConcretePavCal.origvol2.value);

document.ConcretePavCal.cemwei2.value = Math.round((origvol*8.2)*1000)/1000;
document.ConcretePavCal.sandvol2.value = Math.round((origvol*0.56)*100)/100;
document.ConcretePavCal.sandwei2.value = Math.round((origvol*14)*1000)/1000;
document.ConcretePavCal.gravvol2.value = Math.round((origvol*0.933)*100)/100;
document.ConcretePavCal.gravwei2.value = Math.round((origvol*21.93)*1000)/1000;
document.ConcretePavCal.ballvol2.value = Math.round((origvol*1.3)*100)/100;
document.ConcretePavCal.ballwei2.value = Math.round((origvol*32.5)*1000)/1000;
textmessage = 'With this volume of concrete, you should consider buying readymix ';
if (origvol <= 1.5){textmessage = 'You could mix this quantity on site but a cement mixer would make it easier.';}
if (origvol <= 0.5){textmessage = 'It is probably easier to mix this quantity by hand.';}
document.ConcretePavCal.Message2.value = textmessage;
}
//  End -->