[SCRIPT] A question of variables

[The chaser]

Hi, forum.
Maybe I'm being heavy with all my questions, but it's just that i didn't find what i was searching, and i think that in this forum someone will know it.

How can i make this:
If you carry a hammer, wooden planks appear when crossing a script area.
If you don't (the most interesting for me) there are no wooden planks and a monster chases you.
I think it's something like:

void ASDF
{
if (HasItem)== Hammer)
{
SetEntityActive("wooden", true);
}
else
{
SetEntityActive("servant_2", true);
}
}

it says "expected expression value"
If I knew this my map should be fixed.

[GoranGaming]

if(HasItem("Hammer")){
blablabla
}else{
blablabla
}

[FlawlessHappiness]

Isn't it:

if(HasItem("Hammer") == true)
{

}

[GoranGaming]

Oh, yes I think so

[shadowZgamerZ]

The way to do this:

void OnEnter
{
AddEntityCollideCallback("Player", "AREANAME", "FUNCTIONNAME", true, 1);
}

void FUNCTIONNAME(string &in asParent, string &in aChild, int alState)
{
if(HasItem("hammer") == true)
{
SetEntityActive("wooden", true);
}
else
{
SetEntityActive("servant_2, true);
}

NOTE: Function will reactivate itself if Player reenters the map, or put the script under OnStart(). Than, script will be activated when player visits the map for its first time only.