I am trying to control when a user is allowed to enter something into an input field on a visual force page. Something like this:

{!IF(some-condition,<apex:inputField value="{!budget.Jan_Season__c}" />,<apex:outputField value="{!budget.Jan_Season__c}" />)}

When I try to use this, it complains about EL Expression Unbalanced.

Any suggestions would be greatly appreciated.