function imageSwap( id ) {
 try { if ( iePngSwap ) return iePngSwap( id ); } catch ( e ) {}
 var img = document.getElementById( id );
 var normalSuffix = "-midtone";
 var mouseoverSuffix = "-pale";
 if ( img.src.indexOf( mouseoverSuffix ) != -1 ) img.src = img.src.replace( mouseoverSuffix, normalSuffix );
 else img.src = img.src.replace( normalSuffix, mouseoverSuffix );
}