get the real height of an element

gistfile1.js

/**
 * getRealHeight( elem ) 
 * Get the real height of the given element. 
 */
getRealHeight
= function ( elem ) {
    var D = YAHOO.util.Dom;
    var _pos = D.getStyle(elem, 'position');
    var _vis = D.getStyle(elem, 'visibility');
    var clipped = false;
    // We don't want 0 height!
    if ( parseInt( elem.style.height ) == 0 ) {
        elem.style.display = "none";
        elem.style.height = ""
    }
    if (elem.style.display == 'none') {
        clipped = true;
        D.setStyle(elem, 'position', 'absolute');
        D.setStyle(elem, 'visibility', 'hidden');
        D.setStyle(elem, 'display', 'block');
    }
    var height = elem.offsetHeight;
    if (height == 'auto') {
        //This is IE, let's fool it
        D.setStyle(elem, 'zoom', '1');
        height = elem.clientHeight;
    }
    if (clipped) {
        D.setStyle(elem, 'display', 'none');
        D.setStyle(elem, 'visibility', _vis);
        D.setStyle(elem, 'position', _pos);
    }
    //Strip the px from the style
    return parseInt(height);