title: Second Y axis ylab's location
body: <p>I want to draw a double Y axis chart, but when I name the right Y axis name, the name can't be drawed on the right, but lay on the left Y axis's label, what should I do?</p>
  
  <pre><code>plot(1:length(S285$LAI),S285$LAI,axes=F,type="o",pch=1,xlim=c(1,length(S285$LAI)),ylim=c(0,6),xlab="",ylab="LAI",cex.lab=1.5)
  axis(side=1,kk1,S285$DAY[kk1])
  axis(side=2,seq(0,5,1),seq(0,5,1))
  par(new=T)
  plot(1:length(S285$LAI),S285$WSO,axes=F,type="o",pch=15,xlim=c(1,length(S285$LAI)),ylim=c(0,10000),xlab="",ylab="WSO")
  axis(side=1,kk1,S285$DAY[kk1])
  axis(side=4,seq(0,10000,1000),seq(0,10000,1000))
  mtext("DOY285播种",side=3,line=-3.5,at=15)
  legend(x=1,y=6000,legend=c("LAI","产量"),pch=c(1,15),cex=1.1,lty=c(1,1))
  </code></pre>
  
  <p>if you run this code, the two label "LAI" and "WSO" will get together, how to draw WSO to the right side?
  thank you all</p>