function windopen(goal) 
{
var leftx, topy;   var wo= 900, ho= 700;
if (window.screen.width <= wo) { leftx= 0; } 
  else { leftx= Math.floor( (window.screen.width-wo)/2 ); }
if (window.screen.height <= ho) { topy= 150; } 
  else { topy=  Math.floor( (window.screen.height-ho)/2 ); }   
newin=window.open(goal, '', 
      'width=900, height= 700, left='+leftx+', top='+topy+
      ', toolbar=0, location=0, scrollbars=1, resizable=0'); 
}

function windclose() { window.close(); }