var options = {
        width: "fill",
//width options are :
//'fill' (default, equivalent to 100%),
//any valid CSS unit : '90%', '230px', '12em'
        height: "auto", //height options are :
//'auto' (default, will adapt iframe height to its content, the more content, the higher)
//any valid CSS unit : '90%', '230px', '12em'
        autoUpdate : true
// 'true' (default, automatically update iframe height on content changes in the future) or 'false'

};
$("body").iframeResize(options);