Stop a script for a second

Hi together, 

I am new to this list. So perhaps I should introduce myself. I am 25 year old german student studying  congitive neuroscience  in Utrecht/Netherlands. I want to use squeak /etoys mainly for exploring and visualizing some ideas in a quick way. 

Right now I want to build a prototype for an experiment and  think that this is a good project to learn a bit more about squeak. 

I want to program a sequence of objects appearing on different positions on the screen one after the other and later in a random order. 
A very dirty way to do so is just script doing something like. 
object1 show. 
script wait for 1000ms. 
object1 hide
object2 show
script wait for 1000ms. 

I know that this is a very basic question but couldn't find the answer, as I don't know what it is I am looking for. 

thanks a lot

martin
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