/**
 * Method: getRenderedDimensions
 * Renders the contentHTML offscreen to determine actual dimensions for
 *     popup sizing. As we need layout to determine dimensions the content
 *     is rendered -9999px to the left and absolute to ensure the 
 *     scrollbars do not flicker
 *     
 * Parameters:
 * contentHTML
 * size - {<OpenLayers.Size>} If either the 'w' or 'h' properties is 
 *     specified, we fix that dimension of the div to be measured. This is 
 *     useful in the case where we have a limit in one dimension and must 
 *     therefore meaure the flow in the other dimension.
 * options - {Object}
 *     displayClass - {String} Optional parameter.  A CSS class name(s) string
 *         to provide the CSS context of the rendered content.
 * 
 * Returns:
 * {OpenLayers.Size}
 */
OpenLayers.Util.getRenderedDimensions = function(contentHTML, size, options) {
    
    var w, h;
    
    // create temp container div with restricted size
    var container = document.createElement("div");
    container.style.overflow= "";
    container.style.position = "absolute";
    container.style.left = "-9999px";
        
    //fix a dimension, if specified.
    if (size) {
        if (size.w) {
            w = size.w;
            container.style.width = w + "px";
        } else if (size.h) {
            h = size.h;
            container.style.height = h + "px";
        }
    }

    //add css classes, if specified
    if (options && options.displayClass) {
        container.className = options.displayClass;
    }
    
    // create temp content div and assign content
    var content = document.createElement("div");
    content.innerHTML = contentHTML;
    
    // add content to restricted container 
    container.appendChild(content);

    // append container to body for rendering
    document.body.appendChild(container);
    
    // calculate scroll width of content and add corners and shadow width
    if (!w) {
        w = parseInt(content.scrollWidth);
        // update container width to allow height to adjust
        container.style.width = w + "px";
    }        
    // capture height and add shadow and corner image widths
    if (!h) {
        h = parseInt(content.scrollHeight);
    }
    
    //h = 'auto';
    //alert (h);
	
    // remove elements
    container.removeChild(content);
    document.body.removeChild(container);
    
    return new OpenLayers.Size(w, h);
};