function checkDate(x) {
  d = x.value
  
  errorFound = 0
  
  if (d.length > 0 && d.length != 10 && d.length != 9 && d.length != 8 && d.length != 6) {
    errorFound = 1
  }

  for (i=0; i < d.length; i++) {
    c = d.charAt(i)
    
    if (c != "/" && isNaN(c)) {
      errorFound = 1
    }
    
    if ((i == 0 || i > 5) && c == "/") {
      errorFound = 1
    }
  }
  
  if (errorFound == 1) {
    alert("Date must be in mm/dd/yyyy format")
    x.focus()
    return false
  } else {
    return true
  }
}