How to validate one  textbox is choosed another texbox  read
                            
                         
                        
                     
                 
                
                    
Hai Friends,
 
  I ve the page like these
date = "textbox"
from = "textbox"
to = "textbox"
lodging = "textbox"
food bill = "textbox"
fixed claim = "textbox"
when the user tried to fill lodging+food bill +fixed allowance means ll show error "You caNT ALLOW ENTER FIXED ALLOWANCE"
condition is (lodging+food bills is filled means not allowed for fixed allowance,
they ch00sed fixed allowance means no (LOdging+food )