var newWnd = 0;
function showCalculator() {
	if(newWnd != 0) newWnd.close();
	var wndWidth = 520;
	var wndHeight = 478;
	var left = screen.availWidth / 2 - wndWidth / 2 - 20;
	var top = screen.availHeight / 2 - wndHeight / 2 - 30;
	var options="toolbar=no, location=no, directories=no, status=no, menubar=no, resizable=no, scrollbars=yes, width=" + wndWidth + ", height=" + wndHeight +", left=" + left + ", top=" + top;
	newWnd = window.open('_blank', 'startup', options);
	newWnd.location.href="http://www.380v.ru/calc/calculator/step_1.phtml";
	newWnd.focus();
}