<apex:form >
        <div id="menu">
            <apex:pageblock title="Category">
                <apex:repeat value="{!categories}" var="category">
                    <apex:pageBlockSection >
                        <apex:outputLink value="/apex/indexPage"  styleClass="btn">{!category.Name}
                            <apex:param name="id" value="{!category.id}"/>
                        </apex:outputLink>
                    </apex:pageBlockSection>
                </apex:repeat>
            </apex:pageblock>
        </div>
        <div id="col2">
            <apex:pageBlock >
                <apex:pageBlockSection >
                    <apex:repeat value="{!items}" var="ite">
                        <apex:outputField value="{!ite.Photo__c}"></apex:outputField>
                        <apex:outputLink value="/apex/Items">{!ite.Name}
                            <apex:param name="idItem" value="{!ite.id}"/>
                        </apex:outputLink>
                        <pageBlock>
                            <apex:inputText value="{!count}">
                            </apex:inputText>
                            <apex:commandLink value="Add" action="{!add}"  styleClass="btn">

                                <apex:param name="item" value="{!ite.id}"/>
                            </apex:commandLink>

                        </pageBlock>
                    </apex:repeat>
                </apex:pageBlockSection>
            </apex:pageBlock>
        </div>
    </apex:form>
</apex:page>

public void add() {
        Cookie counter = ApexPages.currentPage().getCookies().get('item');
        Integer ig = count;
        System.debug('VALUE' + ig);
        if (counter == null) {
            globalItem = ApexPages.currentPage().getParameters().get('item');
            for (Integer i = 0; i < ig; i++) {
                globalItem = globalItem + ApexPages.currentPage().getParameters().get('item');
            }

            CookieJar cookieJar = new CookieJar(globalItem);
        } else {
            System.debug('VALUE' + ig);
            String currentItem = ApexPages.currentPage().getParameters().get('item');
            for (Integer i = 0; i < ig; i++) {
                System.debug('i:' + i);
                currentItem = currentItem + ApexPages.currentPage().getParameters().get('item');
            }
            globalItem = counter.getValue() + currentItem;
            CookieJar cookieJar = new CookieJar(globalItem);
        }
    }