var one='mailto:sales@';
var two= 'aff';
var three='edit.com';
var emailsum='<a href="'+one+two+three+'">Contact</a>';


function checker()
{
  email=document.customer.customerId.value
  customerName=document.customer.customerName.value
  if(email=='' || customerName=='')
  {
   alert("Both form boxes have to be filled in")
   return false
  }
  else return true
}