function so2( objName1, objName2, objName3 )
{
oObj1 = document.getElementById( objName1 );
oObj2 = document.getElementById( objName2 );
oObj3 = document.getElementById( objName3 );
oObj1c = document.getElementById( objName1 + "c" );
oObj2c = document.getElementById( objName2 + "c" );
oObj3c = document.getElementById( objName3 + "c" );
oObj1.style.display = "block";
oObj1c.className = "mon3";
oObj2.style.display = "none";
oObj2c.className = "mon2";
oObj3.style.display = "none";
oObj3c.className = "mon2";
}