function date (form){
var Serial=form.inputbox.value;
if(Serial<=0)
	{Message="That was an invalid serial number";Year="";}
else{
if(Serial<=4001)
	{Message="Your Marlin lever action rifle was manufactured before 1883";Year="";}
else{Message="Your Marlin lever action rifle was manufactured about ";
if(Serial<=6700)
	{Year=1883;}
else{
if(Serial<=8850)
	{Year=1884;}
else{
if(Serial<=11300)
	{Year=1885;}
else{
if(Serial<=15000)
	{Year=1886;}
else{
if(Serial<=17800)
	{Year=1887;}
else{
if(Serial<=21500)
	{Year=1888;}
else{
if(Serial<=30000)
	{Year=1889;}
else{
if(Serial<=45000)
	{Year=1890;}
else{
if(Serial<=63250)
	{Year=1891;}
else{
if(Serial<=80250)
	{Year=1892;}
else{
if(Serial<=95750)
	{Year=1893;}
else{
if(Serial<=115000)
	{Year=1894;}
else{
if(Serial<=133000)
	{Year=1895;}
else{
if(Serial<=144400)
	{Year=1896;}
else{
if(Serial<=161200)
	{Year=1897;}
else{
if(Serial<=175500)
	{Year=1898;}
else{
if(Serial<=196000)
	{Year=1899;}
else{
if(Serial<=213000)
	{Year=1900;}
else{
if(Serial<=233300)
	{Year=1901;}
else{
if(Serial<=262500)
	{Year=1902;}
else{
if(Serial<=287300)
	{Year=1903;}
else{
if(Serial<=310500)
	{Year=1904;}
else{
if(Serial<=329000)
	{Year=1905;}
else{
if(Serial<=355300)
	{Year=1906;}
else{
if(Serial>=355301)
	{Year="1907 or later";}
else{Message="That was an invalid serial number";Year="";}
}}}}}}}}}}}}}}}}}}}}}}}}}}
alert (Message + Year+".");
}