jquery Field Updation

<apex:page standardController="Opportunity" id="Lpti_New_Opportunity">
<apex:includeScript value="{!URLFOR($Resource.JQuery, 'jquery1.9.1.min.js')}"/>
<script>
    $(document).ready(function(){
    
    StageChangeEvent();
    $('[Id$=iptProbability]').parent().append('<div style="position: absolute;background: gray;min-height: 22px;width: 156px;margin-top: -24px;opacity: 0.2;"></div>');
    
    FillCloseDate();
    });
    
    function FillCloseDate()
    {
       
        var today = new Date();
        var dd = today.getDate();
        var mm = today.getMonth()+1; //January is 0!
        var yyyy = today.getFullYear();
        
        if(dd<10) {
            dd='0'+dd
        }
        
        if(mm<10) {
            mm='0'+mm
        }
        
        today = date.(mm+'/'+dd+'/'+yyyy);
        
        $('[Id$=closedate]').val(today);
      
    }
    
    
    function StageChangeEvent(){
        $('[Id$=iptStage]').change(function(){
        
            if($('[Id$=iptStage]').val()=="Closed Won"){
                $('[Id$=iptProbability]').val(100);              
                $('[Id$=iptNumberOfInstallment]').attr('disabled',false);
            }else if($('[Id$=iptStage]').val()=="Proposal/First Quote sent"){
                $('[Id$=iptProbability]').val(40);
                DisableInastllment();
            }else if($('[Id$=iptStage]').val()=="Transferred - B2B"){
                $('[Id$=iptProbability]').val(50);
                DisableInastllment();
            }else if($('[Id$=iptStage]').val()=="Negotiation/Review"){
                $('[Id$=iptProbability]').val(60);
                DisableInastllment();
            }else if($('[Id$=iptStage]').val()=="Closed Lost"){
                $('[Id$=iptProbability]').val(0);
                DisableInastllment();
            }else if($('[Id$=iptStage]').val()==""){
                $('[Id$=iptProbability]').val(0);
            }            
        });
    }
</script>

<apex:pageMessages ></apex:pageMessages>
 <apex:form id="mainFrm">
        <apex:pageBlock id="pbMain">
            <apex:pageBlockButtons >
                <apex:commandButton value="Save" action="{!Save}"/>
                <apex:commandButton value="Cancel" action="{!Cancel}"/>
                
            </apex:pageBlockButtons>
            <apex:pageblockSection title="Opportunity Information" id="pbsOppInfo" >
                <apex:outputField value="{!Opportunity.Ownerid}" id="ow" rendered="{!$CurrentPage.parameters.id!=null}" />
                <apex:repeat id="rptBasicInfo" value="{!$ObjectType.Opportunity.FieldSets.OpportunityInfo}" var="inOppInfo">                    
                      <apex:inputField id="infldBasicInfo" value="{!Opportunity[inOppInfo]}"></apex:inputField>
                </apex:repeat>
                
                <apex:inputField value="{!Opportunity.OppContact__c}" id="iptContact" rendered="{!if($CurrentPage.Parameters.id !='' && Opportunity.OppContact__c != '',true,false)}"/>   
                <apex:inputField value="{!Opportunity.StageName}" id="iptStage" required="true"/>   
               <!-- <apex:inputField value="{!Opportunity.Probability}" id="iptProbability"/> -->
            </apex:pageblockSection>
            <div style="display:none">
                <apex:inputField value="{!Opportunity.Probability}" id="iptProbability"/>
                <apex:inputField id="closedate" value="{!Opportunity.closedate}"/>
                
            </div>
            <apex:pageblockSection title="Holiday Details" >                
                <apex:repeat id="rptHolidayInfo" value="{!$ObjectType.Opportunity.FieldSets.Holiday_Details}" var="inHoliday">
                      <apex:inputField id="inHolidayInfo" value="{!Opportunity[inHoliday]}"  required="{!OR(inHoliday.required, inHoliday.dbrequired)}"></apex:inputField>
                </apex:repeat>
            </apex:pageblockSection>
           <!--  <apex:pageBlockSection title="OpportunityInformation" id="pbsOppInfo">
                <apex:outputText value="{!$User.FirstName} {!$User.LastName}" label="Opportunity owner" rendered="{!$CurrentPage.parameters.id==null}" style="margin-left:10px;"/>
                <apex:inputField value="{!Opportunity.Name}" id="iptname" required="true"/>
                <apex:inputField value="{!Opportunity.Accountid}" id="iptSalutation" />
                <apex:inputField value="{!Opportunity.OppContact__c}" id="idcontact" required="true"/>
                <apex:inputField value="{!Opportunity.Type}" id="ipttype" required="true"/>   
                <apex:inputField value="{!Opportunity.Lpti_Group_Size__c}" id="iptgroupsource" required="true"/>
                <apex:inputField value="{!Opportunity.LeadSource}" id="iptLeadSource" />           
                <apex:inputField value="{!Opportunity.Amount}" id="iptAmount" />
                <apex:inputField value="{!Opportunity.CloseDate}" id="iptclosedate" required="true"/>
                <apex:inputField value="{!Opportunity.StageName}" id="ipstage" required="true"/>
                <apex:inputField value="{!Opportunity.Probability}" id="iptProbability"/>
                <apex:inputField value="{!Opportunity.Lpti_Mobile_Number__c}"  id="iptCompany"/>
              </apex:pageBlockSection>
              
              <apex:pageBlockSection title="Holiday Details">
                <apex:inputField value="{!Opportunity.Lpti_Business__c}" id="ipbusiness" required="true" />
                <apex:inputField value="{!Opportunity.Lpti_Product__c}" id="ipproduuct" required="true"/>
                <apex:inputField value="{!Opportunity.Lpti_Tour_Type__c}" id="iptour" required="true"/>
                <apex:inputField value="{!Opportunity.Lpti_Circuit_Program__c}" id="iptcircuit" required="true"/>
                <apex:inputField value="{!Opportunity.Lpti_Level__c}" id="iptlevel" required="true"/>
                <apex:inputField value="{!Opportunity.Lpti_Duration_of_Travel__c}" style="width:150px;" id="iptDestinationLocation" />
                <apex:inputField value="{!Opportunity.TUI_Month_of_travel__c}" id="iptReg" />
                <apex:inputField value="{!Opportunity.Lpti_Children_6_12__c}" id="ipchildren" />
                <apex:inputField value="{!Opportunity.Lpti_Children_0_5__c}" id="iptchildren5" />
              </apex:pageBlockSection>
                
              <apex:pageBlockSection title="Passenger Details">
                <apex:inputField value="{!Opportunity.Lpti_Duration_of_Travel__c}" style="width:150px;" id="iptDestinationLocation" />
                <apex:inputField value="{!Opportunity.TUI_Month_of_travel__c}" id="iptReg" />
                <apex:inputField value="{!Opportunity.Lpti_Children_6_12__c}" id="ipchildren" />
                <apex:inputField value="{!Opportunity.Lpti_Children_0_5__c}" id="iptchildren5" />
              </apex:pageBlockSection>  -->
              
              <apex:pageBlockSection title="Additional Information">
                <apex:inputField value="{!Opportunity.Lpti_Lost_Reasons__c}" id="ipbaddress" style="width:150px;" />
              </apex:pageBlockSection>
           
        </apex:pageBlock>
 </apex:form>
            
</apex:page>