function getWindowHeight() {
    var windowHeight=0;
    
    if (typeof(window.innerHeight)=='number') {
    
        windowHeight=parent.window.innerHeight;
    }
    else {
        if (document.documentElement && document.documentElement.clientHeight) {
        
        
         windowHeight = parent.document.documentElement.clientHeight;
        }
        else {
            if (document.body&&document.body.clientHeight) {
        
                windowHeight=parent.document.body.clientHeight;
            }
        }
    }
    return windowHeight ;
}