I have a URL hack which works fine, but I now need to insert an IF statement in to check for a null condition and use another field if so. What am I doing wrong here?
/500/e?
CF00NO00000029qLz={!Order.OrderNumber}
&CF00NO00000029qLz_lkid={!Order.Id}
&retURL={!Order.Id}
&RecordType=012O00000009PQf
&ent=Case
&cas4={!Account.Name}
&cas3={!IF({!Order.Therapist__c}=NULL,{!Order.CustomerAuthorizedBy},
{!Order.Therapist__c})}
&CF00NO0000002MGH0={!Order.EndUser__c}
&00NO00000029qMO=Customer
&00NO00000029qr2=1