// allows enter only numbers
function numeralsOnly(event)
{
	var keyCode = event.keyCode;

	if (arguments.length > 1)
	{
		for (var i = 1; i < arguments.length; i++)
		{
			if (arguments[i] == keyCode) return true;
		}
	}

	if (keyCode > 31 && (keyCode < 48 || keyCode > 57))
	{
		return false;
	}

	return true;
}

function wOpen(url, width, height, scroll)
{
	var offleft = parseInt((screen.availWidth/2) - (width/2));
	var offtop = parseInt((screen.availHeight/2) - (height/2));
	var features, win;

	features = "modal=yes, width=" + width + ", height=" + height +
	", status=no, resizable=no, left=" + offleft + ",top=" + offtop +
	", screenX=" + offleft + ", screenY=" + offtop + ", scrollbars=" + scroll;

	window.open(url, null, features).focus();
}