[Solved] Why this code fails the first time?

Please, helpme:

This code doesn't work the first time when the web page loads, the rest of the time it works fine:

<action name="centermylayer">
set(layer[skin_map_scrollarea].x, calc(layer[elstand].x * -1));
set(layer[skin_map_scrollarea].y, calc(layer[elstand].y * -1));
</action>

Any idea?

Solved: preload="true" in layer "skin_map_image" (parent is skin_map_scrollarea)