$("#email").bind('input propertychange', function() {
if(/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/.test($("#email").val())){
$("#btnSendcode").attr("disabled",false);
}else{
$("#btnSendcode").attr("disabled",true);
}
});
$("#email").bind('input propertychange', function() {
if(/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/.test($("#email").val())){
$("#btnSendcode").attr("disabled",false);
}else{
$("#btnSendcode").attr("disabled",true);
}
});