function Special(name) {
 var x=(self.screen.width/2)-300;
 var y=(self.screen.height/2)-250;
 var s='left='+x+','+'top='+y+',';
 var s1='width='+600+','+'height='+500+',';
 var fname='special.html'; 
 window.open(fname,'special',s+s1+'status=no,toolbar=no,menubar=no,scrollbars=no,resizable=no');
}