function ValidateForm(form)
{

   if(IsEmpty(form.Customers_Firstname)) 
   { 
      alert('You have not entered a Firstname') 
      form.Customers_Firstname.focus(); 
      return false; 
   } 
   
   if(IsEmpty(form.Customers_Surname)) 
   { 
      alert('You have not entered a Surname') 
      form.Customers_Surname.focus(); 
      return false; 
   } 
   
   if(IsEmpty(form.Customers_Address1)) 
   { 
      alert('You have not entered Address 1') 
      form.Customers_Address1.focus(); 
      return false; 
   } 
   
   if(IsEmpty(form.Customers_Address2)) 
   { 
      alert('You have not entered Address 2') 
      form.Customers_Address2.focus(); 
      return false; 
   } 
   
   if(IsEmpty(form.Customers_City)) 
   { 
      alert('You have not entered a City') 
      form.Customers_City.focus(); 
      return false; 
   } 

   if(IsEmpty(form.Customers_County)) 
   { 
      alert('You have not entered a County') 
      form.Customers_County.focus(); 
      return false; 
   } 
   
   if(IsEmpty(form.Customers_Postcode)) 
   { 
      alert('You have not entered a Postcode') 
      form.Customers_Postcode.focus(); 
      return false; 
   } 
   
   if(IsEmpty(form.Customers_Email)) 
   { 
      alert('You have not entered an Email Address') 
      form.Customers_Email.focus(); 
      return false; 
   } 

   if(IsEmpty(form.Customers_Phone)) 
   { 
      alert('You have not entered a Phone Number') 
      form.Customers_Phone.focus(); 
      return false; 
   } 

 
return true;
 
} 

function IsEmpty(aTextField) {
   if ((aTextField.value.length==0) ||
   (aTextField.value==null)) {
      return true;
   }
   else { return false; }
}	

function isValidEmail(str) {

   return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
 


}

function IsNumeric(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
   }