img1=new Image(136,137);
img1.src="images/btn1-on.gif";
img2=new Image(136,137);
img2.src="images/btn2-on.gif";
img3=new Image(136,137);
img3.src="images/btn3-on.gif";
img4=new Image(136,137);
img4.src="images/btn4-on.gif";
img5=new Image(136,137);
img5.src="images/btn5-on.gif";
img6=new Image(136,137);
img6.src="images/btn6-on.gif";