if (document.images) {
img1on = new Image();   img1on.src = "images/but1a.gif";
img2on = new Image();   img2on.src = "images/but2a.gif";
img3on = new Image();   img3on.src = "images/but3a.gif";
img4on = new Image();   img4on.src = "images/but4a.gif";
img5on = new Image();   img5on.src = "images/but5a.gif";
img6on = new Image();   img6on.src = "images/but6a.gif";
img7on = new Image();   img7on.src = "images/but7a.gif";
img8on = new Image();   img8on.src = "images/but8a.gif"; 
img9on = new Image();   img9on.src = "images/but62c.gif"; 
img10on = new Image();   img10on.src = "images/but61c.gif"; 
img11on = new Image();   img11on.src = "images/but63c.gif"; 
img13on = new Image();   img13on.src = "images/but35c.gif"; 
img14on = new Image();   img14on.src = "images/but23c.gif"; 
img15on = new Image();   img15on.src = "images/but9a.gif"; 
img22on = new Image();   img22on.src = "images/but12a.gif"; 
img23on = new Image();   img23on.src = "images/but51a.gif"; 
img24on = new Image();   img24on.src = "images/but10a.gif"; 
       			
img1off = new Image();  img1off.src = "images/but1.gif";
img2off = new Image();  img2off.src = "images/but2.gif";
img3off = new Image();  img3off.src = "images/but3.gif";
img4off = new Image();  img4off.src = "images/but4.gif";
img5off = new Image();  img5off.src = "images/but5.gif";
img6off = new Image();  img6off.src = "images/but6.gif";
img7off = new Image();  img7off.src = "images/but7.gif";
img8off = new Image();  img8off.src = "images/but8.gif";
img9off = new Image();  img9off.src = "images/but61a.gif";
img10off = new Image();  img10off.src = "images/but62a.gif";
img11off = new Image();  img11off.src = "images/but63a.gif";
img12off = new Image();  img12off.src = "images/but34a.gif";
img13off = new Image();  img13off.src = "images/but35a.gif";
img14off = new Image();  img14off.src = "images/but23a.gif";
img15off = new Image();  img15off.src = "images/but9.gif";
img22off = new Image();  img22off.src = "images/but12.gif";
img23off = new Image();  img23off.src = "images/but51.gif";
img24off = new Image();  img24off.src = "images/but10.gif";

}function imgOn(imgName) {if (document.images) {document[imgName].src = eval(imgName + "on.src");}}function imgOff(imgName) {if (document.images) {document[imgName].src = eval(imgName + "off.src");}}