var isIE6 = /msie|MSIE 6/.test(navigator.userAgent);
var isIE7 = /msie|MSIE 7/.test(navigator.userAgent);

function getElementHeight(elementId) {
    return document.getElementById(elementId).clientHeight;                      
}
        
function setElementHeight(elementId,height) {
    document.getElementById(elementId).style.height = height+"px";
}        

function getElementsByClass(node,searchClass,tag) {
    var classElements = new Array();
    var els = node.getElementsByTagName(tag);
    var elsLen = els.length;
    for (i = 0, j = 0; i < elsLen; i++) {
        if ( els[i].className.indexOf(searchClass) != -1 ) {
            classElements[j] = els[i];
            j++;
        }
    }
    return classElements;
}