function Ajax() {

    this.parameters = "";
    this.loopParameters=0;

    this.requestAjax = function(url) {

        ajax.request({
            url:""+url+"",
            beforeSend:united.loading(true),
            data:ajax.parameters,
            cache:true,
            dataType:'script'
        });

    }
    this.request = function(opts) {

        $.ajax(
            opts
            );
        this.clear();
    }
    
    this.clear = function() {
        
        this.parameters="";
        this.loopParameters=0;
        
    }
    
    this.addParameter = function(id_campo,value_campo) {

        this.loopParameters++;
        this.parameters += (this.loopParameters==1) ? ""+id_campo+"="+value_campo+"":"&"+id_campo+"="+value_campo+"";

    }
	
}
var ajax = new Ajax();