MS Excel 2007 IF Function problems.?

Hello,

I need immediate assistance. basically i am trying to use the IF function to display
less than 18 "no",
more than 18 "yes".
but if 23.5/> "HIGH"
been trying for hours! need help asap. tried nesting.
=IF(G3<18,"No",IF(G3>18<23,"Yes",IF(G3>23.5"HIGH")))
failed...

closest i got was something like
=IF(G9<18,"NO","YES"+IF(G9>23.5,HIGH)
still not working. is there something i am doing wrong? need help asap!
thanks

is there something im doing wrong? or am i just way off?