I got a JQuery printfunction:

function doPrintPage()
{
    myWindow = window.open('', '', 'titlebar=yes,menubar=yes,status=yes,scrollbars=yes,width=800,height=600');
    myWindow.document.open();
    myWindow.document.write(document.getElementById("studentnummer").value);
    myWindow.document.write(document.getElementById("Voornaam").value + " " + document.getElementById("Tussenvoegsel").value + " " + document.getElementById("Achternaam").value);
    myWindow.document.write("</br>");
    myWindow.document.write("Result");
    myWindow.document.write(document.getElementById('tab1').innerHTML);
    myWindow.document.write("</br>");
    myWindow.document.write("Tree");
    myWindow.document.write(document.getElementById('tab2').innerHTML);
    myWindow.document.write("</br>");
    myWindow.document.write("Open");
    myWindow.document.write(document.getElementById('tab3').innerHTML);
    myWindow.document.write("</br>");
    myWindow.document.write("Free");
    myWindow.document.write(document.getElementById('tab4').innerHTML);
    myWindow.document.close();
    myWindow.focus();
}

There are 3 gridviews (elements in "tab#"), and on the page that is generated by this script, eacht gridview gets a header (Results, Tree, Open, Free). It is possible that there is no gridview for "Tree". It would be nice if the "tree" header wouldn't be shown either. EDIT: I tried this:

if ($('tab4')[0]) {myWindow.document.write("Free");
myWindow.document.write(document.getElementById('tab4').innerHTML);

but it seems not to work either... Anyone knows the solution?