function isSelected(listname,option,MessageText)
// checks to see if a choice is made from a selectbox 
// inputs:  listname [array with numbers ("n","n+1")]
// outputs: true of false [boolean]
{
for (var i = 0 ; i < listname.length ; i++)
          
    {
     if (document.forms[0].elements[parseInt(listname[i])].selectedIndex == 0 |
         document.forms[0].elements[parseInt(listname[i])].selectedIndex == "NONE" |
         document.forms[0].elements[parseInt(listname[i])].selectedIndex == ""
         )
        {
             
          alert (MessageText)
              document.forms[0].elements[parseInt(listname[i])].focus();
              return false;
              break
             
        }
    }
return true
}