Lua Paralyze Scroll

[roriscrave]

local combat = createCombatObject()

setCombatParam(combat, COMBAT_PARAM_TARGETCASTERORTOPMOST, true)
setCombatParam(combat, COMBAT_PARAM_EFFECT, 187)

local condition = createConditionObject(CONDITION_PARALYZE)
setConditionParam(condition, CONDITION_PARAM_TICKS, 20000)
setConditionParam(condition, CONDITION_PARAM_SPEED, -getPlayerLevel(target)*2)
setConditionFormula(condition, -0.9, 0, -0.9, 0)
setCombatCondition(combat, condition)

function onCastSpell(cid, var)
return doCombat(cid, combat, var)
end

What should I do for this script to remove target speed, according to the target level?
I put it in red as an example, I know it's wrong, but I do not know how to do it the right way.
TFS 0.3.6
TKX