function docalc(){
a=0;
deposit=document.form.deposit.value;
time=document.form.time.value;

if (time == "12") {
multiplier=0.08759
}
else if (time == "18") {
multiplier=0.05973
}
else if (time == "36") {
multiplier=0.03194
}
else if (time == "48") {
multiplier=0.02503
}
else if (time == "60") {
multiplier=0.02090
}

windowcost=document.form.windowcost.value;
y=(a+deposit)*1;
zout=(windowcost-y)*1;
document.form.zout.value=zout;
document.form.y.value=y;
a=multiplier*zout;
j=a*time;
tootal=j+(deposit*1);
//h=((time/12*4.5)*zout)/100;
//i=(h+zout)*1;
//j=Math.ceil(i/time);
document.form.payout.value=a.toFixed(2);
document.form.totalcost.value=j.toFixed(2);
document.form.totalpayable.value=tootal.toFixed(2);
}