function NewWindow(url,wname) {

var MyWin = null;
var scrw = screen.availWidth;
var scrh = screen.availHeight;
var whgt = scrh - 100;

  if (wname == 'prices'){
    wwidth = 275;
  }
  
  else if (wname == 'ns8gps') {
    wwidth = 550;
  }

  else if (wname == 'accessory') {
    wwidth = 575;
  }

  scrw2 = ((scrw/2) - wwidth/2);
 

  MyWin = window.open(url,wname,'top=5,left='+scrw2+',width='+wwidth+',height='+whgt+',scrollbars=1');

if (MyWin == null) window.open();  
}