if (document.images)
{
var img1on = new Image();   img1on.src = "images/pol1a.gif";
var img2on = new Image();   img2on.src = "images/pol2a.gif";
var img3on = new Image();   img3on.src = "images/pol3a.gif";
var img4on = new Image();   img4on.src = "images/pol4a.gif";
var img5on = new Image();   img5on.src = "images/pol5a.gif";
var img6on = new Image();   img6on.src = "images/pol6a.gif";

var img1off = new Image();  img1off.src = "images/pol1.gif";
var img2off = new Image();  img2off.src = "images/pol2.gif";
var img3off = new Image();  img3off.src = "images/pol3.gif";
var img4off = new Image();  img4off.src = "images/pol4.gif";
var img5off = new Image();  img5off.src = "images/pol5.gif";
var img6off = new Image();  img6off.src = "images/pol6.gif";
}