function eliminar_usuarios(){
	$("#dialog").dialog("close");
	var where='';
	var n=$("table tbody tr td input:checked").map(function() {return $(this).attr("id");
 	});
	for (var i = 0; i < n.length; i++) {
		where+="idbkend_users="+n[i]+" and ";
	}
	where=where.substr(0,where.length-4);
	//alert(where);
	$.ajax({
		type:"POST",
		url:"services/service_bck_index.php",
		data:"where="+where+"&del_bckusers="+1,
		beforeSubmit: function () {
			$("#usarios_backend").html("");
			$("#usarios_backend").append($('#loading').show());
		},
		success: function(msg){
			switch(msg){
				case '1':	showMsg('Exito','exito','El(los) usuario(s) fue(fueron) eliminado(s) con exito');
							tabla_bckusers();
			}
		}

	});
}