function contr() {
if ((document.list.tag6002[0].selectedIndex == 0 == true) && (document.list.tag6002[1].selectedIndex == 0 == true))
{
alert("no field has been selected");
return false;
}
if ((document.list.tag6002[0].selectedIndex == 0 == false) && (document.list.tag6002[1].selectedIndex == 0 == false))
{
alert("two fields have been selected");
return false;
}
}