Untitled

<html>
<table class="ms-cal-gempty" width="100%" cellspacing="0" cellpadding="0" summary="Weekly graphical Calendar View">
    <tbody>
        <tr>
            <td class="ms-cal-weekedge">1</td>
            <td class="ms-cal-weekempty">1</td>
            <th class="ms-cal-wtopdayL" nowrap="" onclick="javascript:MoveToViewDate('11.02.2013','Day');" onmouseout="this.className = 'ms-cal-wtopdayL';" onmouseover="this.className = 'ms-cal-wtopdayLover';" colspan="3" scope="col">1</th>
            <th class="ms-cal-wtopday-today" nowrap="" onclick="javascript:MoveToViewDate('12.02.2013','Day');" onmouseout="this.className = 'ms-cal-wtopday-today';" onmouseover="this.className = 'ms-cal-wtopday-todayover';" colspan="3" scope="col">1</th>
            <th class="ms-cal-wtopday" nowrap="" onclick="javascript:MoveToViewDate('13.02.2013','Day');" onmouseout="this.className = 'ms-cal-wtopday';" onmouseover="this.className = 'ms-cal-wtopdayover';" colspan="3" scope="col">1</th>
            <th class="ms-cal-wtopday" nowrap="" onclick="javascript:MoveToViewDate('14.02.2013','Day');" onmouseout="this.className = 'ms-cal-wtopday';" onmouseover="this.className = 'ms-cal-wtopdayover';" colspan="3" scope="col">1</th>
            <th class="ms-cal-wtopday" nowrap="" onclick="javascript:MoveToViewDate('15.02.2013','Day');" onmouseout="this.className = 'ms-cal-wtopday';" onmouseover="this.className = 'ms-cal-wtopdayover';" colspan="3" scope="col">1</th>
            <th class="ms-cal-wtopday" nowrap="" onclick="javascript:MoveToViewDate('16.02.2013','Day');" onmouseout="this.className = 'ms-cal-wtopday';" onmouseover="this.className = 'ms-cal-wtopdayover';" colspan="3" scope="col">1</th>
            <th class="ms-cal-wtopday" nowrap="" onclick="javascript:MoveToViewDate('17.02.2013','Day');" onmouseout="this.className = 'ms-cal-wtopday';" onmouseover="this.className = 'ms-cal-wtopdayover';" colspan="3" scope="col">1</th>
        </tr>
        <tr>
            <td class="ms-cal-weekedge">1</td>
            <td class="ms-cal-time">1</td>
            <td class="ms-cal-walldayeventL" colspan="21">1</td>
        </tr>
        <tr>
            <td class="ms-cal-weekedge">1</td>
            <th class="ms-cal-workhourF" target="_self" onclick="javascript:ClickTime('/sites/retainedorganisation/csoperationalexcellence/Lists/Calendar/NewForm.aspx','7:00');return false;" onmouseout="this.className = 'ms-cal-workhourF';" onmouseover="this.className = 'ms-cal-workhourFover';" scope="row">1</th>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
            <td class="ms-cal-enoworkhourF">1</td>
        </tr>
    </tbody>
</table>
<script>
function foo() {
    var aTR = document.getElementsByClassName("ms-cal-gempty")[0].getElementsByTagName("tr"),
    elmParent = aTR[0].parentNode, sHtml;

    for (var i=aTR.length-1; i>=0; i--) {
        sHtml = aTR[i].innerHTML;
        if (sHtml.toLowerCase().indexOf("td")>-1 && sHtml.indexOf("ms-cal-walldayevent")<0) {
            elmParent.removeChild(aTR[i]);
        }
    }
}
</script>
<button onclick="foo">Fjern linjer</button>
</html>