function writetolayer(lay,txt) {

			

    var ie4 = (document.all) ? true : false;

    var ns4 = (document.layers) ? true : false;

    var ns6 = (document.getElementById && !document.all) ? true : false;



    if (ie4) {

        document.all[lay].innerHTML = txt;

    }

    if (ns4) {

        document[lay].document.write(txt);

        document[lay].document.close();

    }

    if (ns6) {

	    document.getElementById(lay).innerHTML = txt;

    }

}



function validateForm(){



	errormsg = "The following fields are required:\n";



	a = document.form1.years.value;

	b = document.form1.loanamount.value;

	c = document.form1.interest.value;



	if (a == ''){errormsg += "\n  - Please enter Period in years" + "\t\t";}

	if (b == ''){errormsg += "\n  - Please enter Loan amount" + "\t\t";}

	if (c == ''){errormsg += "\n  - Please enter Interest rate" + "\t\t";}



	

	if (errormsg != "The following fields are required:\n")

	{

		alert (errormsg);

		return false;

	}

	else 

	{

		return true;

	}

 

}



function doCalcs() {

	if (validateForm()) {



		var loanAmount, interestdividedby100, yearsLeft, interestEntered;

		var myvalue1, myvalue2, x, y, repayment, interestOnly;

		

		loanAmount = document.form1.loanamount.value;

		interestEntered = document.form1.interest.value;

		yearsLeft = document.form1.years.value;

		

		interestdividedby100 = interestEntered/100;

		

		myvalue1 = loanAmount*(interestdividedby100/12);

		

		x=(1+(interestdividedby100/12));

		y=((yearsLeft*12)*-1);

		

		myvalue2 = 1-Math.pow(x,y);

		



		RepaymentMessage = '$ ' + getRepayment(myvalue1, myvalue2);	

		InterestOnlyMessage = '$ ' + getInterest(interestdividedby100, loanAmount);



		writetolayer('repaymentmsg', RepaymentMessage);

		writetolayer('interestonlymsg', InterestOnlyMessage);

	

	    doCalcs2();

	

		return false;

	}



}



function doCalcs2() {

	if (validateForm()) {

		var loanAmount, interestEntered, yearsLeft, changedInterest; 

		var interestdividedby100, myvalue1, x, y, myvalue2, MyrIntonly, MyrRepayment;

		loanAmount = document.form1.loanamount.value;

		interestEntered = parseFloat(document.form1.interest.value);

		yearsLeft = document.form1.years.value;

		changedInterest = parseFloat(document.getElementById('percent').options[document.getElementById('percent').selectedIndex].value);

		

		interestdividedby100 = (interestEntered + changedInterest)/100;

		

		myvalue1 = loanAmount*(interestdividedby100/12);

		

		x=(1+(interestdividedby100/12));

		y=((yearsLeft*12)*-1);

		

		myvalue2 = 1-Math.pow(x,y);



		MyrRepayment = '$ ' + getRepayment(myvalue1, myvalue2);	

		MyrIntonly = '$ ' + getInterest(interestdividedby100, loanAmount);

	

		writetolayer('myintonlymsg', MyrIntonly);

	  	writetolayer('myrepaymentmsg', MyrRepayment);

	}

		return false;

}



function getRepayment(value1, value2)

{

    return ((Math.round(100*value1/value2))/100).toFixed(2);

}



function getInterest(value1, value2)

{

    return ((Math.round(value1*value2))/12).toFixed(2);

}



function clearForm()

{

        document.form1.reset();

		writetolayer('repaymentmsg', ' ');

		writetolayer('interestonlymsg', ' ');

		writetolayer('myintonlymsg', ' ');

	  	writetolayer('myrepaymentmsg', ' ');

}



//-->