// contact
function trimString (str)
{
  	return str.replace(/^s+/g, '').replace(/s+$/g, '');
}

function er(id,did,sms){
      	var elem = document.getElementById(id);
		
        if(trimString(elem.value) == "")
		{
            elem.className = 'skipped';
            document.getElementById(did).innerHTML = sms;			
        }
		else
		{
            elem.className = 'noclass';  
			document.getElementById(did).innerHTML = '<img src=images/c.gif>';
        }		
}

function erm(id,did){	
      
		var reEmail = /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;
		var elem = document.getElementById(id);
		
        if(trimString(elem.value) == "")
		{
            elem.className = 'skipped';
            document.getElementById(did).innerHTML = '<br><img src=images/dt.gif> Vui l&ograve;ng nh&#7853;p e-mail !';
        }
		else if(!trimString(elem.value).match(reEmail))
		{
			elem.className = 'skipped';
			document.getElementById(did).innerHTML = '<br><img src=images/dt.gif> V&iacute; d&#7909; e-mail: eidoan@yahoo.com !';
		}			
		else
		{
			elem.className = 'noclass';  
			document.getElementById(did).innerHTML = '<img src=images/c.gif>';
		}	
		
}
function sm(a,b,c,d,e)
{
		var reEmail = /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;
		var elem = document.getElementById('email');
		
		var result="a="+a+"&b="+b+"&c="+c+"&d="+d+"&e="+e;	
		var jax = new Ajax();
		if(a=='')
		{
			er('fullname','fullname_container','<br><img src=images/dt.gif align=absmiddle> Vui l&ograve;ng nh&#7853;p h&#7885; v&agrave; t&ecirc;n !');
		}
		else if(!trimString(c).match(reEmail))
		{
			elem.className = 'skipped';
			document.getElementById('email_').innerHTML = '<br><img src=images/dt.gif> Email c&#7911;a b&#7841;n ch&#432;a h&#7907;p l&#7879; !';
		}	
		else if(e=='')
		{
			er('mess','mess_container','<br><img src=images/dt.gif align=absmiddle> Vui l&ograve;ng nh&#7853;p n&#7897;i dung !');
		}
		else
		{
			document.getElementById('send').disabled=true
			var hienthi=document.getElementById('sending')
	
			hienthi.innerHTML="<img src=images/indicator_blue.gif align=absmiddle> &#272; a n g &nbsp; g &#7917; i ..."
			jax.onreadystatechange = function(){
				if(jax.readyState == 4){
					if (jax.status==200){			
							
							var html=jax.responseText
							hienthi.innerHTML=html							
					}
				 }
			}
			var url="_check.php"
			jax.open("POST",url,true);
			jax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
			jax.send(result)  
		}
}