Simple "IF" statement question

I have been reading manuals for hours and can find this. I am loading some text from a XML file, if there is no text at all I want to go to frame 5. If there is text do nothing. I can’t find out how to write this. I tried things like:

if (songtitletwo_txt < 0) {
gotoAndPlay(5);
}

Anyone know how to write this. Songtitletwo_txt is my variable that has or doesn’t have text in it.