vb5hk51n=xppr('5hk51_0.gif');vb5hk51o=xppr('5hk51_1.gif');vb5hk51c=xppr('5hk51_2.gif');var btIdPref='vb';function xppr(im){var i=new Image();i.src='images/bt'+im;return i;};function xpe(id){x=id.substring(0,id.length-1);if(document[btIdPref+x])document[btIdPref+x].src=eval(btIdPref+id+'.src');return false;};