adding projects to a project at the same path level

[FiruzzZ]

I got a main project and I added other like "libs" (MyUtils.jar, MyCustomSwings.jar and so on) and what I want when I compile it , it's that looks like this:

dist/
mainproject.jar
MyUtils.jar
MycustomSwing.jar
log4j.properties
dist/lib


AND NOT
dist/
mainproject.jar
dist/lib/
MyUtils.jar
MycustomSwing.jar

How could I do this? and more important, What impact does this have on my project?