assertion in netbeans 5.5

Hellohow can i compile my program as assertion enabled in netbeans 5.5?i have looked at options menu but couldn't find...
[143 byte] By [xyzta] at [2007-11-26 18:13:23]
# 1
project properties -> Run -> type "-ea" in VM options field
telman_a at 2007-7-9 5:46:27 > top of Java-index,Java Essentials,New To Java...