function openform() 
{
var centw=((screen.width-560)/2);
var centh=((screen.height-520)/2);
window.open('../forma.htm','mywindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,copyhistory=yes,resizable=yes,top='+centh+',left='+centw+'');
}