function ow(page,w,h){
	ow_left = window.screen.width/2-w/2;
	ow_top = window.screen.height/2-h/2;
	window.open(page,"ow","scrollbars=yes,resizable=no,width="+w+",height="+h+",left="+ow_left+",top="+ow_top+",menubar=no,toolbar=no");
}