simple ts plot question

Hi, I have a simple question regarding plots of time series. I 
have two time series, say ts1.ts and ts2.ts. They are both monthly. 
The first one ranges from 1944:2 through 1999:7 whereas the second 
one ranges from 1974:1 through 1993:6. How can I plot both of them 
in the same plot (the shorther series would be only displayed in a 
section of the x axis since it is shorter). 

My naive try was 

plot(c(ts1.ts, ts2.ts), xlab="time", ylab="")

but it did not work. Note: I have defined the two series as 

Try
  > plot(cbind(ts1.ts,ts2.ts),xlab="time", ylab="", plot.type="single")

  or better something like:
  > plot(cbind(ts1.ts,ts2.ts),plot.type="single",
  + col=c("yellow","red"),lty=c("solid","dotted")) #colours and patterns

  It can also be helpful to contrast 'c(ts1.ts,ts2.ts)' with
  'cbind(ts1.ts,ts2.ts)'.

  guido

  
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