Creating advance search query in MSSQL 2005

Hi,

I am creating query on MSSQL 2005. I have advanced search option in my form.
Where user can select any criteria, based on critera selected the result should come

Please help me how to put where clause in my stored procedure so that selected parameter should only passed to where clause

For example if fromdate and todate is selected then in where clause, it should come something like this

where s.CreationDate > convert(datetime,@fromdate)
and s.CreationDate < convert(datetime,@todate)

I have following parameter

@fromDate DATETIME = NULL  
 ,@toDate DATETIME = NULL    
 ,@paymentType nVARCHAR(10) = NULL    
 ,@paymentStatus nVARCHAR(10) = NULL  
 ,@Order_Code nVARCHAR(50) = NULL  


Please advise

Create procedure
@fromDate DATETIME = NULL  
 ,@toDate DATETIME = NULL    
 ,@paymentType nVARCHAR(10) = NULL    
 ,@paymentStatus nVARCHAR(10) = NULL   
 ,@Order_Code nVARCHAR(50) = NULL  
as
Select                                    
S.ID,                               
S.CourseTitle ,                           
P.Title,                                  
Coalesce(P.FirstName,'')+' '+Coalesce(P.MiddleName,'')+' '+ Coalesce(P.MiddleName,'')+ ', '+ Coalesce(P.FamilyName,'')+ ', '+ Coalesce(C.EMail,'') as [User Name],
C.Country as Country,                     
C.City,                                   
Coalesce(C.AddressLine1,'') +', '+ Coalesce(C.AddressLine2,'') +', '+ Coalesce(C.POBox,'') +', '+ Coalesce(C.zipCode,'') as [Full Address],
'M:'+Coalesce(C.Mobile,'') +', W:'+Coalesce(C.Telephone,'') +', FX:'+ Coalesce(C.Fax,'') as [Contact Details],
CASE WHEN PD.WithEK = 1 THEN 'Yes' ELSE 'No' END AS [Parents/Guardian with EK?],
PD.StaffNumber,                           
S.CreationDate as [Registration Date],                
Coalesce(S.Currency,'') +' '+ Coalesce(cast(CO.Amount as nvarchar(30)),'') [Payment Amount],
S.PaymentMode as [Payment Mode],                
S.PaymentProof as [Payment Proof],              
S.OrderCode as [Order ID],                      
CO.OrderReference as [Order Reference],         
CO.orderStatus as [Order Status],               
CASE WHEN CO.MaskedCardNumber IS NULL THEN 'NA' ELSE CO.MaskedCardNumber END AS [Masked Card Number],
CASE WHEN CO.CardHolderName IS NULL THEN 'NA' ELSE CO.CardHolderName END AS [Card Holder Name],
CASE WHEN CO.CardBilliingAddress IS NULL THEN 'NA' ELSE CO.CardBilliingAddress END AS [Card Billing Address],
CO.Comments,                              
CO.CPGAuthCode as [Brass Number],               
CO.ModifiedDate,                          
S.Creationdate                            
from EACR_Students S                      
inner join EACR_PersonalDetails P on S.PersonalDetailID = P.ID --and  s.CreationDate > convert(datetime,'2013-04-30 00:00:00')
inner join EACR_ParentDetails PD on S.ParentDetailID = PD.ID      
inner join EACR_ContactDetails C on S.ContactDetailID=C.ID 
inner join EACR_ImportantDetails I on  S.ImportantDetailID=I.ID
left join EAC_ConferenceOrder CO on  S.OrderCode = CO.OrderCode

where 
 -- Need to add criteria

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