function change1(img,img_n) 
{
	if(img_n==1)
		document.images[img].src = "u62.gif";
	else
		document.images[img].src = "u62.gif";
} 

function change2(img,img_n) 
{
	if(img_n==1)
		document.images[img].src = "u64.gif";
	else
		document.images[img].src = "u641.gif";
} 

function change3(img,img_n) 
{
	if(img_n==1)
		document.images[img].src = "u66.gif";
	else
		document.images[img].src = "u661.gif";
} 

function change4(img,img_n) 
{
	if(img_n==1)
		document.images[img].src = "u68.gif";
	else
		document.images[img].src = "u681.gif";
}