function enter(roomid){
	roomtype=roomid.substring(0,1)
	roomtype=roomtype.toLowerCase()
  	if(roomtype=="t"){
  		document.formchat.action="http://talk3.silversand.net/loginroom.php"
  	}else{
  		document.formchat.action="http://talk3.silversand.net/loginchat.php"
  	}
  	if(validname(document.formchat.USER)){ 	
		document.formchat.roomid.value=roomid
		document.formchat.submit()
  	}
}
function validname(str1)
{
	if (str1.value.length <1) {
		alert("请输入您的大名，名字不能为空！");
		str1.focus();
      		return false;
   	}
	str=str1.value.toString();
	if( ((str.search("#")!=-1)||(str.search('&')!=-1))){
		alert("名字中不能包含特殊字符: # & .");
 		str1.focus();
      		return false;
   	}
	return true;
}
var focusok=false;
if (navigator.appName == "Netscape") {
 focusok=true;
}
vers = navigator.appVersion;
if (navigator.appName == "Microsoft Internet Explorer") {
 pos = vers.lastIndexOf('.'); 
 vers = vers.substring(pos-1,vers.length); 
}
proper_version = parseFloat(vers); 
if(proper_version>=5){
 focusok=true;
}
function launchchat() {
  var chat = window.open("","chat","top=0,left=0,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=790,height=530");
   if(focusok){
 chat.focus();
   }
   return true;
}