function popup(url, width, height, target)
{
	return window.open(url, target, "width="+width+", height="+height+", resizable, scrollbars=1, status=1");
}

function plural_form(number)
{
    var index = 0;
	if(number == 1)
		index = 0;
	else
		if((number%10 >= 2) && (number%10 <= 4) && (number%100 < 10 || number%100 >= 20))
			index = 1;
		else
			index = 2;
	return index;
}