Set field to required using javascript

Hi Everyone
I am looking for a method to set a field to required inside javascript. i.e.
if (this.rawValue==1)
{ ConditionalField.Setattribute=required}
else
ConditionalField Setattribut=optional
Thanks for your help
Regards
Meir

Thanks Peter and sorry for the mixup. Fortunately I found a solution so no need to repost it even.
Regards
Meir.
P.S. Keep up the good work on the forum!

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Message was edited by:
user615023

Hi,
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Please make sure that 'null' & null are entirly different thing.
may be when system get hang, you might have written 'null' in stead of null.
Thanks.

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