function pop_up_window(sTarget,sTitle,sWidth,sHeight,sResize,sScroll) {
	wPopUp = window.open(sTarget, sTitle, 'width=' + sWidth + ',height=' + sHeight + ',resizeable=' + sResize + ',scrollbars=yes');
	wPopUp.focus()
}

function validate_email(str) {
	l = str.length;
	at=str.indexOf("@");
	lastdot = str.lastIndexOf(".");
	if (at < 1 || (lastdot > l-3) || (lastdot-at < 2)) 
	return false;
}