function popup(url) 

{

 var width  = 530;

 var height = 630;

 var left   = (screen.width  - width)/2;

 var top    = (screen.height - height)/2;

 var params = 'width='+width+', height='+height;

 params += ', top='+top+', left='+left;

 params += ', directories=no';

 params += ', location=no';

 params += ', menubar=no';

 params += ', resizable=no';

 params += ', scrollbars=no';

 params += ', status=no';

 params += ', toolbar=no';

 params += ', urlbar=no';

 newwin=window.open(url,'windowname5', params);

 if (window.focus) {newwin.focus()}

 return false;

}