function cln(){
document.shb.name.value="";
}
function clse(){
document.fsearch.word.value="";
}
function cll(){
document.mlogin.email.value="";
}
function clp(){
document.mlogin.password.value="";
}
function clmess(){
document.shb.message.value="";
}
function checkfield()
{
if (document.formreg.username.value=="")
		{
		alert ("ban chua nhap cho truong username");
		document.formreg.username.focus;
		return false;
		}
	username=document.formreg.username.value;
	pos_username = username.indexOf("#");
	if(pos_username >= 0)
		{
		alert ("username chua ky tu ko hop le");
		document.formreg.password.focus;
		return false;
		}
if (document.formreg.password.value=="")
		{
		alert ("ban chua nhap cho truong password");
		document.formreg.password.focus;
		return false;
		}
	password=document.formreg.password.value;
	pos_password = password.indexOf("#");
	if(pos_password >= 0)
		{
		alert ("password chua ky tu ko hop le");
		document.formreg.password.focus;
		return false;
		}
if (document.formreg.repassword.value=="")
		{
		alert ("ban chua nhap cho truong repassword");
		document.formreg.repassword.focus;
		return false;
		}		
if (document.formreg.repassword.value != document.formreg.password.value)
		{
		alert ("password chua trung nhau");
		document.formreg.repassword.focus;
		return false;
		}
if (document.formreg.email.value=="")
		{
		alert ("ban chua nhap cho truong email");
		document.formreg.email.focus;
		return false;
		}
	email=document.formreg.email.value;
	pos_email = email.indexOf("#");
	if(pos_email >= 0)
		{
		alert ("email chua ky tu ko hop le");
		document.formreg.email.focus;
		return false;
		}

	if(document.formreg.email.value!="")
	{
	var vt=document.formreg.email.value.indexOf("@");
	var vtd=document.formreg.email.value.indexOf(".");
	var sp=document.formreg.email.value.indexOf(" ");
	if((vt==-1)||(vt==0)||
		(vtd==-1)||(vtd<vt+1)||
		(vtd>document.formreg.email.value.length-1)||(sp!=-1))
		{
		//return 0;
		alert("Email khong hop le");
		document.formreg.email.focus();
		return false;
		}
	}

}
function checksearch()
{
if (document.fsearch.word.value=="")
		{
		alert ("ban chua nhap vao o tim kiem");
		document.fsearch.word.focus;
		return false;
		}
	word=document.fsearch.word.value;
	pos_word = word.indexOf("#");
	if(pos_word >= 0)
		{
		alert ("tu ban nhap chua ky tu ko hop le");
		document.fsearch.word.focus;
		return false;
		}
}

var tabselect = "test1";
function changetab( this_id )
{
	if ( this_id != tabselect )
	{
		document.getElementById( this_id ).className = "block_tab_selected"; 
		
		document.getElementById( tabselect ).className = "block_tab"; 
		
		tabselect = this_id;
	}
}
function show(url,id,eval_str){
    if(document.getElementById){var x=(window.ActiveXObject)?new ActiveXObject("Microsoft.XMLHTTP"):new XMLHttpRequest();}
    if(x){x.onreadystatechange=function() {
        el=document.getElementById(id); 
        el.innerHTML='loading....';
        if(x.readyState==4&&x.status==200){
            el.innerHTML=''; 
            el=document.getElementById(id);
            el.innerHTML=x.responseText; 
            eval(eval_str);
            }
        }
    x.open("GET",url,true);x.send(null);
    }
}
//--------
loadstatustext = 'Loading.......';
  function makePOSTAddRequest(url, parameters) {
     http_request = false;
     if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
             // set type accordingly to anticipated content type
           //http_request.overrideMimeType('text/xml');
           http_request.overrideMimeType('text/html');
         }
     } else if (window.ActiveXObject) { // IE
         try {
           http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
           try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
           } catch (e) {}
         }
     }
     if (!http_request) {
         alert('Cannot create XMLHTTP instance');
         return false;
     }
     http_request.onreadystatechange = alertAdd;
     http_request.open('POST', url, true);
     http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
     http_request.setRequestHeader("Content-length", parameters.length);
     http_request.setRequestHeader("Connection", "close");
     http_request.send(parameters);
   }
   function alertAdd() {
       document.getElementById('noidung').innerHTML = loadstatustext;
     if (http_request.readyState == 4) {
         if (http_request.status == 200) {
           //alert(http_request.responseText);
           result = http_request.responseText;
           document.getElementById('noidung').innerHTML = '';
           document.getElementById('noidung').innerHTML = result;           
         } else {
           alert('There was a problem with the request.');
         }
     }
   }
function get_dulieu(obj) {
    var data = "formdata="+encodeURIComponent( document.getElementById("username").value )
    data= data+ '#'+encodeURIComponent( document.getElementById("password").value )
	data= data+ '#'+encodeURIComponent( document.getElementById("email").value )  	
	data= data+ '#'+encodeURIComponent( document.getElementById("sex").value )		
    makePOSTAddRequest('regcom.php', data);
    }
function get_search(obj) {
    var tu = "fdata="+encodeURIComponent( document.getElementById("word").value )
    tu= tu+ '#'+encodeURIComponent( document.getElementById("tuychon").value )
    makePOSTAddRequest('result_search.php', tu);
    }