function ChuanXau(str){
	strChuan=str;
	strChuan=ThayThe(strChuan,"~");
	strChuan=ThayThe(strChuan,"%");
	strChuan=ThayThe(strChuan,"@");
	strChuan=ThayThe(strChuan,"#");
	strChuan=ThayThe(strChuan,"$");
	strChuan=ThayThe(strChuan,"^");
	strChuan=ThayThe(strChuan,"&");
	strChuan=ThayThe(strChuan,"*");
	strChuan=ThayThe(strChuan,"'");
	strChuan=Trim(strChuan);		
	return strChuan;
	
}
function ChuanXau_Email(str){
	strChuan = str;
	return strChuan;
}

function ChuanXauNoiDung(str){
	strChuan = str;
	strChuan = ThayThe(strChuan," ");
	strChuan = ThayThe(strChuan," ");
	if(strChuan=="") strChuan="<p></p>";
	return strChuan;
}

function Trim(s){
  while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r')){
    s = s.substring(1,s.length);
  }
  while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r')){
    s = s.substring(0,s.length-1);
  }
  if(s=="<p></p>")
  	s="";
  return s;
}
function ThayThe(str,KyTu){
	while (str.indexOf(KyTu)>=0){
		str = str.replace(KyTu,"");	
	} 
	return str;
}