[SalesForce] apex:selectList always passing older value on onchange..

I am using apex:selectList..I want to get the value on onchange of the selectlist..But for first time when i am debugging the value..Its blank..ID comes when i change it again(Second time)..But its the previous value..If i change it again..It again shows the previous value,not the new value and so on..
So it gives me the old value.?`

Please help Its urgent

{!hr.p} The value get refreshed on the VF page but not in the controler

Updated

    <apex:pageBlockTable value="{!wrapperTimeCardList}" var="hr" id="thePbTable">
       <apex:column >
        <apex:selectList value="{!hr.p}" size="1" multiselect="false" onchange="proIp('{!hr.pp}');">

                              <apex:actionSupport event="onchange" action="{!taks}" reRender="thePb">
                                   <apex:param name="prId"  value="{!hr.p}"  assignTo="{!proIdVal}" ></apex:param>
                               </apex:actionSupport>
                               Project: <apex:selectOptions value="{!hr.projectListOptions}"/>
                          </apex:selectList>`
    </apex:column >
    </apex:pageBlockTable>

    public void fp()
        {

             **value is blank here for First time,then old value always.???**


        }


**Wrapper Class**

    public List<wrapperliass> wrappeList{get;set;}
        public class wlass{
            public List<Selectoption> prOptions{get;set;}
            public List<Selectoption> pListOptions{get;set;}
            public String pVal{get;set;}
            public String prskVal{get;set;}

            Public blob fileData{get;set;}


            public wrapperTimeCardClass(List<Selectoption> Options,List<Selectoption> ptions,
                                                               ){
                this.prptions=tOptions;
                this.proOptions=projectTaions; 
                this.projVal='';                                   

            }

        }