index.html

    $('form[target=ajax]').live('submit', function(){
        var data	= [],
            $this		= $(this),
            self		= this,
            onajax		= window[$this.attr('onajax')],
            call		= window[$this.attr('call')];

        if(typeof call!='function'){
            call=function(){}
        }
        if('function'==typeof onajax){
            try{
                if(onajax.call(this)===false) return false;
            }catch(err){
                call.call(self, err);
                return false;
            }
        }
        $(':input[name]', this).each(function(){
            var $this=$(this),
                value=$this.data('value'),
                name=$this.attr('name');
            if($this.is(':radio, :checkbox') && this.checked==false) return true;
            if(value===undefined) value=this.value;
            data.push({name:name, value:value});
        });
        $.ajax({
            url:$this.attr('action'),
            async:true,
            data:data,
            type:$this.attr('method')||'get',
            dataType:$this.attr('dataType')||'json',
            headers:{"x-form-call":1},
            error:function(xhr, textStatus, errThrow){
                call.call(self, errThrow||textStatus);
            },
            success:function(data, textStatus, xhr, headers){
                var errorMessage=xhr.getResponseHeader('X-Error-Message');
                if(errorMessage){
                    call.call(self, decodeURIComponent(errorMessage), data);
                }else{
                    call.call(self, null, data);
                }
            }
        });
        return false;
    });