function change_it(thespan)
{
 var oncolor="lightsteelblue";
 var offcolor="D6E0FA";
 if (document.getElementById)
 {
   if (eval("document.getElementById('"+thespan+"').style.backgroundColor") !=oncolor)
   {
     eval("document.getElementById('"+thespan+"').style.backgroundColor='"+oncolor+"';");
   }
   else
   {
     eval("document.getElementById('"+thespan+"').style.backgroundColor='"+offcolor+"';");
    }
 }
}