Adding a Frameset to an aspx webpage

try this

<div  id="ifrm" >
      <iframe name="ttframe"
              id="ttframe"
              src="Put your source here"
              scrolling="no"
              marginwidth="0"
              marginheight="0"
              frameborder="0"
              width=100%
              height=0
              style="position:relative; left:0px; top:0px;">
      </iframe>
    </div>

One of the issues with iframe is that you can not set a height in terms of percentage. So, either you need to try it set it in css ( I am not sure if that is possible ) or you need to adjust it using JavaScript as shown.

// JScript File
$(function () {
    if ($.browser.safari || $.browser.opera) {
        // Start timer when loaded.
        $("#ttframe").load(function () {
            setTimeout(resizeAllIFrames, 0);
        }
        );
    }
    else {
        resizeIFrame();
        $("#ttframe").load(resizeIFrame);
    }
});
function resizeIFrame() {
    if ($.browser.safari || $.browser.opera) {
    }
    else {
        var ttfrm = $("#ttframe");
        var innerDoc = (ttfrm.get(0).contentDocument) ?
                    ttfrm.get(0).contentDocument :
                    ttfrm.get(0).contentWindow.document;
        ttfrm.height(innerDoc.body.scrollHeight + 35);
    }
    location.href = "#";
}
// Resize heights.
function resizeAllIFrames() {
    var ttfrm = $("#ttframe");
    var innerDoc = (ttfrm.get(0).contentDocument) ?
                    ttfrm.get(0).contentDocument :
                    ttfrm.get(0).contentWindow.document;
    ttfrm.height(innerDoc.body.scrollHeight + 35);
    location.href = "#";
}