function popwin_center(u,w,h,s,m,t){
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	p = "width=" + w + ",height=" + h +  ",scrollbars=" + s + ",menubar=" + m + ",toolbar=" + t + ",top=" + TopPosition + ",left=" + LeftPosition;
	neowinmx=window.open(u,"neowinmx",p);
}