function Calculate_Product(){
var firstnum=multiply.num1.value;
if (firstnum=="" || firstnum=="0"){alert("This number should be greater than zero!");multiply.num1.focus();return false}
var secondnum=parseInt(multiply.num2.value);
if (firstnum>=secondnum){alert("The second number should be greater than the first!");multiply.num2.focus();multiply.num2.select();return false}
line.innerHTML="<hr>";
mean.innerHTML="Squared Mean ("+parseInt(firstnum/2+secondnum/2)+"&sup2"+")";
meanR.innerHTML=Comma(Math.pow(parseInt(firstnum/2+secondnum/2),2));
half.innerHTML="Subtract square of half difference ("+(secondnum-firstnum)/2+"&sup2"+")";
halfR.innerHTML="-"+Comma(Math.pow((secondnum-firstnum)/2,2));
product.innerHTML="Product of numbers ("+firstnum+"x"+secondnum+") = ("+Comma(Math.pow(parseInt(firstnum/2+secondnum/2),2))+"-"+Comma(Math.pow((secondnum-firstnum)/2,2))+") =";
productR.innerHTML=Comma(firstnum*secondnum)
}

function oddEven(){
firstNum=parseInt(Product.product1.value);
secondNum=parseInt(Product.product2.value);
if (firstNum%2 !=secondNum%2 && secondNum>=0)
{alert("Both numbers must be ODD or EVEN")}
}

function oddEven1(){
firstNum=parseInt(Product.product1.value);
secondNum=parseInt(Product.product2.value);
if (firstNum%2 !=secondNum%2 && firstNum>=0)
{alert("Both numbers must be ODD or EVEN")}
}

function Comma(number) {
number = '' + number;
if (number.length > 3) {
var mod = number.length % 3;
var output = (mod > 0 ? (number.substring(0,mod)) : '');
for (i=0 ; i < Math.floor(number.length / 3); i++) {
if ((mod == 0) && (i == 0))
output += number.substring(mod+ 3 * i, mod + 3 * i + 3);
else
output+= ',' + number.substring(mod + 3 * i, mod + 3 * i + 3);
}
return (output);
}
else return number;
}

function putFocus(formInst, elementInst)
{document.forms[0].elements[0].focus()}

function addbookmark(){
if (document.all)
{window.external.AddFavorite(document.location,document.title)}
}

var clockID=0
function UpdateClock(){
if (clockID)
{clearTimeout(clockID);
clockID = 0;}

var H,M,S,Mth,Day,AMPM,Yr
var tDate = new Date();
Day=tDate.getDate()
if (Day<10)
{Day="0"+Day;}

Mth=tDate.getMonth()+1
if (Mth==1){Mth="Jan"}
if (Mth==2){Mth="Feb"}
if (Mth==3){Mth="Mar"}
if (Mth==4){Mth="Apr"}
if (Mth==5){Mth="May"}
if (Mth==6){Mth="Jun"}
if (Mth==7){Mth="Jul"}
if (Mth==8){Mth="Aug"}
if (Mth==9){Mth="Sep"}
if (Mth==10){Mth="Oct"}
if (Mth==11){Mth="Nov"}
if (Mth==12){Mth="Dec"}

Yr=tDate.getFullYear()

H=tDate.getHours();
if (H>11)
{AMPM="pm";}
else
{AMPM="am";}

if (H>12)
{H=H-12;}

if (H<10)
{H="0"+H;}

M=tDate.getMinutes()
if (M<10)
{M="0"+M;}

S=tDate.getSeconds()
if (S<10)
{S="0"+S;}

theTime.innerHTML = Day + " " + Mth + " " + Yr + "::"
+ H + ":" + M + ":" + S + AMPM;
clockID = setTimeout("UpdateClock()",1000);
}

function StartClock() {
clockID = setTimeout("UpdateClock()",1000);
}

function KillClock() {
if (clockID)
 {clearTimeout(clockID);
 clockID = 0;}
}