function onregister()
{
	with(document.frm_register)		
	{	mess = "";
		var u = Trim(txtusername.value);
		var e = Trim(txtemail.value);
		var r = Trim(txtrepassword.value);
		var p = Trim(txtpassword.value);
		if ( u=="" || e=="" || p=="" || r=="" || e.lenght<6 || u.length<6 || p.lenght<6 || r.length<6 ) mess +="\n- Thong tin dang ky khong hop le. Phai lon hon 6 ki tu";
		if(u.indexOf(" ")>0) mess +="\n- Ten thanh vien khong duoc co ky tu trang";
		if(r!=p)mess +="\n- Phan xac nhan mat khau khong dung";
		if(!is_email(e)) mess +="\n- Dia chi email khong hop le";	
		if (mess!="") 
			alert(mess);
			else submit();
	}
}

function onlogin()
{
	with(document.frm_login)
	{
		txtusername.value = Trim(txtusername.value);
		txtpassword.value = Trim(txtpassword.value);			
		if (txtusername.value == ""){txtusername.focus(); return;}
		if (txtpassword.value == ""){txtpassword.focus(); return;}
		submit();
	}
}
function onretype()
{
	with(document.frm_retype)
	{
		txtusername.value = Trim(txtusername.value);
		txtemail.value 	  = Trim(txtemail.value);
		if (txtusername.value == "")	{txtusername.focus(); return;}
		if (!is_email(txtemail.value))	{txtemail.focus(); return;}		
		submit();
	}
}