function FilterOn(a,b,t) {
var aa = document.getElementById(a);
var bb = document.getElementById(b);
var tt = document.getElementById(t); 
   tt.style.filter = 'progid:DXImageTransform.Microsoft.fade()';
   tt.filters[0].duration = 1;
   tt.filters[0].Apply();
   bb.style.visibility="visible"; 
   aa.style.visibility="hidden";
   tt.filters[0].Play(duration=1); 
} 

function FilterOff(a,b,t) {
var aa = document.getElementById(a);
var bb = document.getElementById(b);
var tt = document.getElementById(t); 
   tt.style.filter = 'progid:DXImageTransform.Microsoft.fade()';
   tt.filters[0].duration = 1;
   tt.filters[0].Apply();
   bb.style.visibility="hidden";
   aa.style.visibility="visible";
   tt.filters[0].Play(duration=1); 
}