if ((navigator.userAgent.indexOf("Win") != -1)) {
 //win
 if ((navigator.userAgent.indexOf("IE") != -1)) {
  //IE
  document.write("<LINK REL=stylesheet HREF=/talk/styles-w-site.css TYPE=text/css>"); 
 } else {
   document.write("<LINK REL=stylesheet HREF=/talk/styles-site.css TYPE=text/css>"); 
 }
}else {
  //mac
  document.write("<LINK REL=stylesheet HREF=/talk/styles-site.css TYPE=text/css>"); 
}

newWin1 = null;
function popup(Name,title,X,Y){
if(newWin1 != null && !newWin1.closed) {
window.newWin1.close();
}
newWin1=window.open(Name , title,'width='+X+',height='+Y+',menubar=no,toolbar=no,location=no,directories=no,status=no,scrollbars=yes,resizaeable=no,left=200,top=10');
}