function popup( path, w, h, scroll, windowName ){
	if ( screen.width <= 800 ){
		if( ( w + 10 ) >  screen.availWidth ){
			w = screen.availWidth - 10;
		} 
		if( ( h + 29 ) >  screen.availHeight ){
			h = screen.availHeight - 29;
		}
		x = ( screen.availWidth - w - 10 ) / 2;
		y = ( screen.availHeight - h - 29 ) / 2;
	}
	
	if ( screen.width > 800 ){
		x = ( screen.availWidth - w - 10 ) / 2;
		y = ( screen.availHeight - h - 29 ) / 2;
	}
	
	var F2 = window.open( path, windowName, "width=" + w + ",height=" + h + ", top=" + y + ", left=" + x + ",scrollbars=" + scroll );
	F2.focus();
}