mouse rollover action

hello. have transparent button (upbutton), , want move background image (bg1) when mouse rolls on it.

 

so far i've got set mouse moves y+1 when it's on button, seems once. want keep moving bg1, making scroll, until user moves cursor off button.

 

here's have far. applied button (upbutton).

 

on (rollover) {
    setproperty("bg1", _y, "+1");
}

 

thanks in advance help!

is there reason you're using as1?

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