Millisecond Forums

hello! 

in my task, within every trial i have to shift between a trial and a surveypage element (only because i want to use a slider as a response). i have a background image that i have set "erase=false", and it sits still when i'm going through trial elements, but now that i have a surveypage element it jolts every time - is there a way to eliminate this? or set the background image as a default so it doesn't change? 

thank you! 

<trial cue>
/ stimulustimes = [0=background; 0=learnStim]
/ beginresponseframe = 0
/ timeout = 4000
/ validresponse = (noresponse)
/ branch = [
surveypage.slider
]
</trial>

<surveypage slider>
/ stimulustimes = [0=background]
/ questions=[1=estimate]
/ showbackbutton=false
/ finishlabel="Next"
/ showpagenumbers=false
/ showquestionnumbers=false
/ timeout = 5000
/ branch = [
  trial.outcome
]
</surveypage>

<picture background>
/ items = ("background.jpg")
/ size = (100%, 100%)
/ erase = false
</picture>