<apex:page controller="productListController" showHeader="true" sidebar="false">

<apex:pageblock >
    <apex:pageblocksection >
       <apex:pageblocktable var="e" value="{!product}">
             <apex:column headervalue="name" onclick="getProductId('{!e.Id}')" >

                 <apex:outputField value="{!e.Product_Image__c}"/>
                 <apex:outputField value="{!e.name}"/>
             </apex:column>
        </apex:pageblocktable>
     </apex:pageblocksection>
</apex:pageblock>

public class productListController