Rounding down in hundreds

[sjohnson1984]

Hi all, here's a quick for which I haven't been able to track down a quick solution on Google. The 2 amounts delivered ('outgoings' and 'alreadyprotected' will always be between 0 and 9999.

 
 function unprotectedcalc(){
    var outgoings = document.getElementById('EssOutgoings');
    var alreadyprotected = document.getElementById('ProtectedPayments');
    var result = document.getElementById('UnprotectedResult');
 
    var initialresult = parseInt(outgoings.value)- parseInt(alreadyprotected.value);
    initialresult /= 100;
    initialresult = Math.round(initialresult);
    initialresult *= 100;
    result.value = initialresult;
 
 }
 
 

This needs to always round down, rather than your regular type rounding: is this possible in a quick way rather than simply extending the above?

IE 6 XP Pro

Many thanks in advance

J

[mrhoo]

var initialresult = parseInt(outgoings.value)- parseInt(alreadyprotected.value);
result.value =  Math.floor(initialresult/100)*100;