function date (form){
var Serial=form.inputbox.value;
if(Serial<=0)
	{Message="That was an invalid serial number";Year="";}
else{Message="Your Winchester 1876 was manufactured in ";
if(Serial<=1429)
	{Year=1876;}
else{
if(Serial<=3579)
	{Year=1877;}
else{
if(Serial<=7967)
	{Year=1878;}
else{
if(Serial<=8971)
	{Year=1879;}
else{
if(Serial<=14700)
	{Year=1880;}
else{
if(Serial<=21759)
	{Year=1881;}
else{
if(Serial<=32407)
	{Year=1882;}
else{
if(Serial<=42410)
	{Year=1883;}
else{
if(Serial<=54666)
	{Year=1884;}
else{
if(Serial<=58714)
	{Year=1885;}
else{
if(Serial<=60397)
	{Year=1886;}
else{
if(Serial<=62420)
	{Year=1887;}
else{
if(Serial<=63539)
	{Year=1888;}
else{
if(Serial<=63561)
	{Year=1892;}
else{
if(Serial<=63670)
	{Year=1893;}
else{
if(Serial<=63678)
	{Year=1894;}
else{
if(Serial<=63702)
	{Year=1896;}
else{
if(Serial<=63869)
	{Year=1897;}
else{
if(Serial<=63871)
	{Year=1898;}
else{Message="That was an invalid serial number";Year="";}
}}}}}}}}}}}}}}}}}}}
alert (Message + Year+".");
}