[TYPO3] Problems concerning if-statement

[Tapio Markula]

Hi

It seems that I never understand explanations in 
http://typo3.org/documentation/document-library/references/doc_core_tsref/current/view/5/7/

Because I don't properly understand the page (IMO not good examples), I 
need some help.

I can't understand on the base of the documentation, how
conditions change the result.

My TS, which purpose is to render date only if the
value lastUpdated is not zero

20=TEXT
20{
field=lastUpdated

if{
value.data = 0
equals.field = lastUpdated
negate=1
}

date=d.m.Y

}

Problems
1) If i put the date inside the if-statement I get raw data. If I put 
after the if-statement is ignored

2) in menus I must make the cObject for all levels - copy seems not to 
work - it this generic problem with if-statements?