////////////////////////////////////////////////////////////////////////////////////////////////////////
// JavaScript Function Name:  ValidateInputCrs
// Purpose: Checks to make sure at least one criteria selected and checks to make sure that
// if Year is completed, Month must also be (and vice versa).
////////////////////////////////////////////////////////////////////////////////////////////////////////

function ValidateInputCrs()
{
var nlen

 if(document.UsersInput.CrsAceID.value == "" &&
    document.UsersInput.CrsNumber.value == "" &&
    document.UsersInput.CrsKeyword.value == "" &&
    document.UsersInput.CrsYear.value == "" &&
    document.UsersInput.CrsMonth.selectedIndex == 0 &&
    document.UsersInput.CrsLocation.value == "")
 {
  alert('You must enter at least one criterion to perform a search.');
   return false;
 }

    if(document.UsersInput.CrsYear.value == "" && document.UsersInput.CrsMonth.selectedIndex != 0)
  {
  alert('Year must also be completed when searching on Date using Month.');
  return false;
     }

 nLen = document.UsersInput.CrsYear.value;
 nLen = nLen.length;

 if ((nLen == 1) || (nLen == 3))
 {
  alert('Year must be either 2 or 4 digits.');
  return false;
 }
 return true;
}