Rotate Param1 in gani script

[sssssssssss]

I feel stupid because I feel like I should know this, but I can't get it to work and have never done it before. I'm just trying to put a script in a gani to rotate the image set in param1. The below doesn't work.

PHP Code:

function onPlayerEnters() {
    this.rotation= pi*2;
} 


Also tried this, and no go

PHP Code:

SCRIPT
function onPlayerEnters() {

    this.daImg = params[0];

    echo(this.daImg);
    doTheRotator();

}


function doTheRotator() {

    this.rotation += 2;
        //this.rotation = pi*2; tried this too

}
SCRIPTEND 


I'm not gonna lie, because it'd be too obvious if I tried, but I have absolutely no idea what I'm doing lol. I just want the gani to rotate when its set, then entire dang thing, because its only params1 in it. Dunno if its possible and I've never rotated a thing in my life. Just need it to roll over once.