Set the width and height parameters if the object tag:
...
document.getElementById("content").innerHTML='<object type="text/html" data="home.html" style="width:100%; height: 100%;"></object>';
...
edit: With respect to the JSFiddle http://jsfiddle.net/zYw3S/12/ adding
#content{
background-color: #FFFFFF;
border-radius: 10px;
margin-top: 10px;
height: 70vh;
}