function mapPopup( url ) {
	var wx=461, wy=632;
	var sx, sy, px, px;
	
	if(document.all){
		sx = screen.width;
		sy = screen.height;
	}else if( document.layers ) {
		sx = screen.availWidth;
		sy = screen.availHeight;
	}
	px = (sx - wx) / 2;
	py = (sy - wy) / 2;
	var map = window.open( url, "", "width=" + wx + ", height=" + wy + ", resizable=yes, scrollbars=yes" );
	map.moveTo( px, 0 );
}