// Preload Img
these script most probably can't use onload properties except maybe i can add element.set Attrible " onload" that function to try.
sg_a = new Image();
sg_a.src = "images/but_sg_off.gif";
sg_b = new Image();
sg_b.src = "images/but_sg_on.gif";
my_a = new Image();
my_a.src = "images/but_my_off.gif";
my_b = new Image();
my_b.src = "images/but_my_on.gif";
th_a = new Image();
th_a.src = "images/but_th_off.gif";
th_b = new Image();
th_b.src = "images/but_th_on.gif";
vn_a = new Image();
vn_a.src = "images/but_vn_off.gif";
vn_b = new Image();
vn_b.src = "images/but_vn_on.gif";
var OLDIMG="";
var NEWIMG="";
THese will fail if using animated gif files
which do cannot animated
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