function CheckSearch() {

         if(document.f1.what.value=="")
         {
            window.alert('Enter the search criteria, please!');
            document.f1.what.focus();
            return false;
         }

      }

      function CheckFriend() {

         if(document.sfriend.f1.value=="")
         {
            window.alert('Enter your email address!');
            document.sfriend.f1.focus();
            return false;
         }

         if(document.sfriend.f2.value=="")
         {
            window.alert('Enter your friend email address!');
            document.sfriend.f2.focus();
            return false;
         }

      }

      function CheckLogin() {

         if(document.lform.us.value=="")
         {
            window.alert('Enter your username, please!');
            document.lform.us.focus();
            return false;
         }

         if(document.lform.ps.value=="")
         {
            window.alert('Enter your password, please!');
            document.lform.ps.focus();
            return false;
         }

      }

      function CheckForgot() {

         if(document.ForgotForm.u2.value=="")
         {
            window.alert('Enter your username, please!');
            document.ForgotForm.u2.focus();
            return false;
         }
      }

      function CheckRegister() {

         if(document.RegForm.NewUsername.value=="")
         {
            window.alert('Enter your username, please!');
            document.RegForm.NewUsername.focus();
            return false;
         }

         if(document.RegForm.p1.value=="")
         {
            window.alert('Enter your password, please!');
            document.RegForm.p1.focus();
            return false;
         }

         if(document.RegForm.p2.value=="")
         {
            window.alert('Confirm your password, please!');
            document.RegForm.p2.focus();
            return false;
         }

         if(document.RegForm.p1.value != "" && document.RegForm.p2.value != "" && document.RegForm.p1.value != document.RegForm.p2.value)
         {
            window.alert('Enter and confirm your password again!');
            document.RegForm.p1.value="";
            document.RegForm.p2.value="";
            document.RegForm.p1.focus();
            return false;
         }

         if(document.RegForm.FirstName.value=="")
         {
            window.alert('Enter your First Name, please!');
            document.RegForm.FirstName.focus();
            return false;
         }

         if(document.RegForm.LastName.value=="")
         {
            window.alert('Enter your Last Name, please!');
            document.RegForm.LastName.focus();
            return false;
         }

         if(document.RegForm.address.value=="")
         {
            alert('Enter your address, please!');
            document.RegForm.address.focus();
            return false;
         }

         if(document.RegForm.city.value=="")
         {
            alert('Enter your city, please!');
            document.RegForm.city.focus();
            return false;
         }

         if(document.RegForm.state.value=="")
         {
            alert('Enter your state, please!');
            document.RegForm.state.focus();
            return false;
         }

         if(document.RegForm.country.value=="")
         {
            alert('Select your country, please!');
            document.RegForm.country.focus();
            return false;
         }

         if(document.RegForm.phone.value=="")
         {
            window.alert('Enter your Phone, please!');
            document.RegForm.phone.focus();
            return false;
         }

         if(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(document.RegForm.email.value))
         {
            return true;
         }
         
         alert("Invalid E-mail Address! Please re-enter.");
         document.RegForm.email.focus();
         return false;
         

      }

      function CheckProfile() {

         if(document.RegForm.p1.value=="")
         {
            window.alert('Enter your password, please!');
            document.RegForm.p1.focus();
            return false;
         }

         if(document.RegForm.p2.value=="")
         {
            window.alert('Confirm your password, please!');
            document.RegForm.p2.focus();
            return false;
         }

         if(document.RegForm.p1.value != "" && document.RegForm.p2.value != "" && document.RegForm.p1.value != document.RegForm.p2.value)
         {
            window.alert('Enter and confirm your password again!');
            document.RegForm.p1.value="";
            document.RegForm.p2.value="";
            document.RegForm.p1.focus();
            return false;
         }

         if(document.RegForm.FirstName.value=="")
         {
            window.alert('Enter your First Name, please!');
            document.RegForm.FirstName.focus();
            return false;
         }

         if(document.RegForm.LastName.value=="")
         {
            window.alert('Enter your Last Name, please!');
            document.RegForm.LastName.focus();
            return false;
         }

         if(document.RegForm.address.value=="")
         {
            alert('Enter your address, please!');
            document.RegForm.address.focus();
            return false;
         }

         if(document.RegForm.city.value=="")
         {
            alert('Enter your city, please!');
            document.RegForm.city.focus();
            return false;
         }

         if(document.RegForm.state.value=="")
         {
            alert('Enter your state, please!');
            document.RegForm.state.focus();
            return false;
         }

         if(document.RegForm.country.value=="")
         {
            alert('Select your country, please!');
            document.RegForm.country.focus();
            return false;
         }

         if(document.RegForm.phone.value=="")
         {
            window.alert('Enter your Phone, please!');
            document.RegForm.phone.focus();
            return false;
         }

         if(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(document.RegForm.email.value))
         {
            return true;
         }
         
         alert("Invalid E-mail Address! Please re-enter.");
         document.RegForm.email.focus();
         return false;

      }

      function CheckOffer() {
   
         if(document.PostForm.CategoryID.value=="")
         {
            alert('Select the category in which your offer will appear!');
            document.PostForm.CategoryID.focus();
            return false;
         }

         if(document.PostForm.year.value=="")
         {
            alert('Select the vehicle year, please!');
            document.PostForm.year.focus();
            return false;
         }


         if(document.PostForm.VehicleModel.value=="")
         {
            alert('Enter the vehicle model, please!');
            document.PostForm.VehicleModel.focus();
            return false;
         }

         if(document.PostForm.VehicleColor.value=="")
         {
            alert('Enter the vehicle color, please!');
            document.PostForm.VehicleColor.focus();
            return false;
         }

         if(document.PostForm.mileage.value=="")
         {
            alert('Enter the vehicle mileage, please!');
            document.PostForm.mileage.focus();
            return false;
         }

         if(document.PostForm.DetailedDesc.value=="")

         {
            alert('Describe your vehicle in details, please!');
            document.PostForm.DetailedDesc.focus();
            return false;
         }

         if(document.PostForm.Price.value=="")
         {
            alert('Enter the price, please!');
            document.PostForm.Price.focus();
            return false;
         }

      }