how to calculate a textbox value's 12%, extract the ceiling value of it, and fill it in the other textbox.

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Javascript

text

I've used a fuction on key up event in the script below.
All is working fine but I want to round off the value 'p1' as If value is in between 5.000001 - 5.999999 the result should be 6.

Thanks in advance.

$(function () {
var textBox1 = $('input:text[id$=FreightCharges]').keyup(foo);
var textBox2 = $('input:text[id$=FuelSurcharge]').keyup(foo);
var textBox3 = $('input:text[id$=FOV]').keyup(foo);

function foo() {
var value1 = textBox1.val();
var value2 = textBox2.val();
var value3 = textBox3.val(); 
var p1 = per(value1, value2, value3); 
$('input:text[id$=ServiceTax]').val(p1);
}
function per() {
var sum1 = 0, p1 = 0;
for (var i = 0, j = arguments.length; i < j; i++) {
if (IsNumeric(arguments[i])) {
sum1 += parseInt(arguments[i]);
p1 = parseInt(sum1 * 12) / 100;
}
}
return p1;
}
function IsNumeric(input) {
return (input - 0) == input && input.length > 0;
}

});