function oppage(pag, w, h){
	l=(screen.width - w)/2;
	t=(screen.height - h)/2;
	window.open(pag+'.htm', ''+pag+'', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width='+w+',height='+h+',top='+t+',left='+l);
}