function setfocus() {
	document.calcform.x.focus();
}
function calc() {
	x = document.calcform.x.value;
 	y = calcfunc(x);
 	y = roundresult(y);
 	document.calcform.y.value = y
}
function calc_a() {
	x = document.calcform2.x.value;
 	y = calcfunc_a(x);
 	y = roundresult(y);
 	document.calcform2.y.value = y
}
function calc3() {
	x1 = document.calcform.x.value;
	x2 = document.calcform.x2.value;
 	y = calcfunc(x1,x2);
 	y = roundresult(y);
 	document.calcform.y.value = y;
}
function calc4() {
	x1 = document.calcform.x.value;
	x2 = document.calcform.x2.value;
	x3 = document.calcform.x3.value;
 	document.calcform.y1.value = roundresult(calcfunc1(x1,x2,x3));
 	document.calcform.y2.value = roundresult(calcfunc2(x1,x2,x3));
}
function calc5() {
	x = document.calcform.x.value;
 	y = calcfunc(x);
 	y = roundresult(y);
 	if( x>0 ) y='±'+y;
 	document.calcform.y.value = y
}
function calc6() {
	x1 = document.calcform.x.value;
	x2 = document.calcform.x2.value;
	val=x2;
	if( x2<0 ) val=-val;
 	y = calcfunc(x1,val);
 	y = roundresult(y);
 	if( x2>0 && (x1/2)==Math.round(x1/2) ) y='±'+y;
 	if( x2<0 ) {
 		if( (x1/2)==Math.round(x1/2) )
 			y='NaN';
 		else
 			y=-y;
 	}
 	document.calcform.y.value = y;
}
function roundresult(x) {
 	y = parseFloat(x);
 	y = Math.round(y*1.0e13)/1.0e13;
 	return y;
}