function getElementsByClassName(oElm, strTagName, strClassName){
    var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++){
        oElement = arrElements[i];
        if(oRegExp.test(oElement.className))
            arrReturnElements.push(oElement);
    }
    return (arrReturnElements)
}
var swapState = 0;
function swapOversizedComments(arrow_elem){
    if (swapState==0){
        arrow_elem.src = "/media/img/button_arrow-up.png";
        elems = getElementsByClassName(document.getElementById('commentlist'), 'tr', 'comment_oversize');
        for (i=0; i < elems.length; i++)
            elems[i].style.display="block";
        swapState = 1;
    } else {
        arrow_elem.src = "/media/img/button_arrow-down.png";
        elems = getElementsByClassName(document.getElementById('commentlist'), 'tr', 'comment_oversize');
        for (i=0; i < elems.length; i++)
            elems[i].style.display="none";
        swapState = 0;
    }
}