var signUpWin=0;

function signUp(URLStr, left, top, width, height) {
	if(signUpWin) {
		if(!signUpWin.closed) signUpWin.close();
	}
	signUpWin = open(URLStr, 'signUpWin','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}