var g_grWindow;

function openWindow(p_strURL, p_iWidth, p_iHeight) {

    if(!p_iWidth)  p_iWidth     = 800;
    if(!p_iHeight) p_iHeight    = 550;

    if(!g_grWindow || g_grWindow.closed) {
        g_grWindow               = window.open(p_strURL, "g_grWindow", "status, scrollbars, resizable, width=" + p_iWidth + ", height=" + p_iHeight);
        if(!g_grWindow.opener) {
            g_grWindow.opener    = window;
        }
    }
    else {
        g_grWindow.location.href = p_strURL;
        g_grWindow.focus();
    }
}