function validate(frm) 
{	
        if (frm.tenDaiDien.value =="")
  			{
				alert("Xin vui long nhap vao ten nguoi lien he!");
				frm.tenDaiDien.focus();
				return (false);
  			}

		if (frm.diaChiMail.value == "")
  			{
				alert("Xin vui long nhap vao email");
				frm.diaChiMail.focus();
				return (false);
  			}  
  			
		if (frm.diaChiMail.value!= "")
	  	{
			if (frm.diaChiMail.value.indexOf('@', 0) == -1 || frm.diaChiMail.value.indexOf('.', 0) == -1)
			{
				alert("Xin vui long nhap vao email dung! vd: info@itsvn.com ");
				frm.diaChiMail.focus();
				return (false);
			}
  		}	
		  if (frm.noiDung.value =="")
  			{
				alert("Xin nhap vao noi dung lien he!");
				frm.noiDung.focus();
				return (false);
  			}
		
/////Kiem tra ok
			
		  	  
  	return (true);
}