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saleforce beesaleforce bee 

ajax call help needed

<apex:pageBlockTable value="{!prd}" var="a" id="table" border="2">            

                  <apex:column headerValue="Category">

                    <apex:inputField value="{!a.Category__c}"  />


                <apex:column >


                    <apex:outputtext id="dynamictext"   />

                 apex:column > 

                <apex:column headerValue="Description">

                    <apex:inputField value="{!a.Description__c}" />




In above code snippet, when we select value of Category__c some value ,dynamic help text would be displayed in the dynamictext-ouput text.... It should be ajax enabled no postback allowed


Pls help me how to achieve it.