function date (form){
var serial=form.inputbox.value;
if(serial<=12475)
	{message="That was an invalid serial number";year="";}
else{message="Your Winchester Model 1866 was manufactured in ";
if(serial<=14813)
	{year=1866;}
else{
if(serial<=15578)
	{year=1867;}
else{
if(serial<=19768)
	{year=1868;}
else{
if(serial<=29516)
	{year=1869;}
else{
if(serial<=52527)
	{year=1870;}
else{
if(serial<=88184)
	{year=1871;}
else{
if(serial<=109784)
	{year=1872;}
else{
if(serial<=118401)
	{year=1873;}
else{
if(serial<=125038)
	{year=1874;}
else{
if(serial<=125965)
	{year=1875;}
else{
if(serial<=131907)
	{year=1876;}
else{
if(serial<=148207)
	{year=1877;}
else{
if(serial<=150493)
	{year=1878;}
else{
if(serial<=152201)
	{year=1879;}
else{
if(serial<=154379)
	{year=1880;}
else{
if(serial<=156107)
	{year=1881;}
else{
if(serial<=159513)
	{year=1882;}
else{
if(serial<=162376)
	{year=1883;}
else{
if(serial<=163649)
	{year=1884;}
else{
if(serial<=163664)
	{year=1885;}
else{
if(serial<=165071)
	{year=1886;}
else{
if(serial<=165912)
	{year=1887;}
else{
if(serial<=167155)
	{year=1888;}
else{
if(serial<=167401)
	{year=1889;}
else{
if(serial<=167702)
	{year=1890;}
else{
if(serial<=169003)
	{year=1891;}
else{
if(serial<=169007)
	{year=1893;}
else{
if(serial<=169011)
	{year=1894;}
else{
if(serial<=169015)
	{year=1897;}
else{
if(serial<=170100)
	{year=1898;}
else{
{message="That was an invalid serial number";year="";}
}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}
alert (message + year+".");
}