function selchange_s1(){
//
	id    = document.form.s1.selectedIndex;
	value = document.form.s1.options[id].value;
	document.form.y1.value=value;
//
	printtotal();
}
function selchange_s2(){
//
	id    = document.form.s2.selectedIndex;
	value = document.form.s2.options[id].value;
	document.form.y2.value=value;
//
	printtotal();
}
function selchange_s3(){
//
	id    = document.form.s3.selectedIndex;
	value = document.form.s3.options[id].value;
	document.form.y3.value=value;
//
	printtotal();
}
function selchange_s4(){
//
	id    = document.form.s4.selectedIndex;
	value = document.form.s4.options[id].value;
	document.form.y4.value=value;
//
	printtotal();
}
function selchange_s5(){
//
	id    = document.form.s5.selectedIndex;
	value = document.form.s5.options[id].value;
	document.form.y5.value=value;
//
	printtotal();
}
function selchange_s6(){
//
	id    = document.form.s6.selectedIndex;
	value = document.form.s6.options[id].value;
	document.form.y6.value=value;
//
	printtotal();
}
function selchange_s7(){
//
	id    = document.form.s7.selectedIndex;
	value = document.form.s7.options[id].value;
	document.form.y7.value=value;
//
	printtotal();
}
function printtotal(){
	sum=0;
	sum=sum+Number(document.form.y1.value);
	sum=sum+Number(document.form.y2.value);
	sum=sum+Number(document.form.y3.value);
	sum=sum+Number(document.form.y4.value);
	sum=sum+Number(document.form.y5.value);
	sum=sum+Number(document.form.y6.value);
	sum=sum+Number(document.form.y7.value);
	document.form.total.value=sum;
}