How many mistakes... interesting :-)

well.... my iframe is adaptative: its heigth and width fill the container.

I've found the solution with Javascript!!!
It does NOT work for RESIZING, but it's better than nothing :-)

Here it is:

    <!--START SIMPLEVIEWER EMBED -->
    <!-- 100% IE7 Bug Fix by Lametti Federico - www.smallblades.it -->
        <script type="text/javascript" src="svcore/js/simpleviewer.js"></script>
        <script type="text/javascript">
          <!--
            var browserName=navigator.appName;
            if (/MSIE (\d+\.\d+);/.test(navigator.userAgent))
                { /* test for MSIE x.x; */
                    var IEversion=new Number(RegExp.$1); /* capture x.x portion and store as a number */
                }
            else
                { /* Not IE or IE version not detected */
                    var IEversion=0;
                }
            if (browserName=="Microsoft Internet Explorer" && IEversion<8)
                { /* IE7 and previous*/
                    var IE7_w=document.documentElement.clientWidth+'';
                    var IE7_h=document.documentElement.clientHeight+'';
                    jQuery(document).ready(function () {
                        SV.simpleviewer.load('sv-container', IE7_w, IE7_h, '101010', true );
                    });
                }
            else
                { /* IE8, next IE version, other browser */
                    jQuery(document).ready(function () {
                        SV.simpleviewer.load('sv-container', '100%', '100%', '101010', true );
                    });
                }
          //-->
        </script>
        <div id="sv-container"></div>
    <!--END SIMPLEVIEWER EMBED -->