function changeImage1(){
	document.aimg.src="img2.gif";
}
function changeImage2(){
	document.aimg.src="img1.gif";
}
function changeImage3(){
	document.bimg.src="img4.gif";
}
function changeImage4(){
	document.bimg.src="img3.gif";
}
function changeImage5(){
	document.cimg.src="img6.gif";
}
function changeImage6(){
	document.cimg.src="img5.gif";
}
function changeImage7(){
	document.dimg.src="img8.gif";
}
function changeImage8(){
	document.dimg.src="img7.gif";
}
function changeImage9(){
	document.eimg.src="img10.gif";
}
function changeImage10(){
	document.eimg.src="img9.gif";
}
function changeImage11(){
	document.fimg.src="img12.gif";
}
function changeImage12(){
	document.fimg.src="img11.gif";
}

//