Random wait time iMacros

Hi,
I hope someone can help me on how to generate random wait time in iMacros. Basically I need to set it up to wait between 20-30 seconds before executing the next URL GOTO line. I have tried this one that I saw in Google search but it returns the same wait time in the next URL GOTO after the first one. It is random but becomes uniform after the first link. Can someone give me a script to do that or a simple solution to add in
WAIT SECONDS=20 to make it random between 20 to 30 seconds wait time without setting a !var value? Thanks in advance

This is the piece of code I got in Google search:
SET !VAR1 EVAL("var randomNumber=Math.floor(Math.random()*10 + 1); randomNumber;")
URL GOTO=(url of a website)
' waits 1 to 10 seconds
WAIT SECONDS={{!VAR1}}

mods can delete this thread, i found a way on how to fix my script.