public Contact objAcc {get;set;}
public string strAccId {get;set;}

public void createContact()
{
    insert objAcc;
}

<apex:outputPanel id="popup">
            <div id="selectColumnPopup" style="display:none;">
                <div class="popupBackground" layout="block" />
                <div class="popupForeground" style="height:40%; width:43%;" >
                    First Name: <apex:inputField value="{!objAcc.FirstName}" /><br />
                    Last Name: <apex:inputField value="{!objAcc.LastName}" /><br />
                    <apex:commandButton value="Save" action="{!createContact}" />
                    <apex:commandButton value="Cancel" onClick="closePopUp()"/>
                </div>
            </div>
        </apex:outputPanel>

        <apex:outputPanel id="acc1" layout="none" rendered="{!accountList.size!=0}">
            <apex:repeat id="repeatAccount" value="{!accountList}" var="item">
                <tr>
                    <td class="dataCell"><Input type="button" value="Create New Contact" onclick="displayPopUp('{!item.oAccount.Id}')"/></td>
                </tr>
            </apex:repeat>
        </apex:outputPanel>
    </apex:form>

    <script>

        function displayPopUp(accountId)
        {
            alert('here : '+accountId);
            accActionMethod(accountId);
            document.getElementById('selectColumnPopup').style.display = 'block';
        }

        function closePopUp()
        {
            document.getElementById('selectColumnPopup').style.display = 'None';
        }

    </script>
 </apex:pageBlock>