function filter_keyword(source){
	source=source.replace(/ /g,'+');
	source=source.replace(/\#/g,'');
	source=source.replace(/\%/g,'');
	source=source.replace(/\*/g,'');
	source=source.replace(/\?/g,'');
	source=source.replace(/\"/g,'');
	source=source.replace(/\'/g,'');
	return source;
}

function kodau(str) {  
  str= str.toLowerCase();  
  str= str.replace(/à|á|ạ|ả|ã|â|ầ|ấ|ậ|ẩ|ẫ|ă|ằ|ắ|ặ|ẳ|ẵ/g,"a");  
  str= str.replace(/è|é|ẹ|ẻ|ẽ|ê|ề|ế|ệ|ể|ễ/g,"e");  
  str= str.replace(/ì|í|ị|ỉ|ĩ/g,"i");  
  str= str.replace(/ò|ó|ọ|ỏ|õ|ô|ồ|ố|ộ|ổ|ỗ|ơ|ờ|ớ|ợ|ở|ỡ/g,"o");  
  str= str.replace(/ù|ú|ụ|ủ|ũ|ư|ừ|ứ|ự|ử|ữ/g,"u");  
  str= str.replace(/ỳ|ý|ỵ|ỷ|ỹ/g,"y");  
  str= str.replace(/đ/g,"d");  
  str= str.replace(/ /g,"-"); 
  str= str.replace(/\'|\"|\/|\\/g,""); 
  return str;  
  }  
  
function setConfirmUnload(a) {
    window.onbeforeunload = a ? function () {return a;} : null;
}

function setCookies(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}

function getCookies(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    {
    c_start=c_start + c_name.length+1;
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    }
  }
return "";
}