function checkHeight()
{
    var contentBlock = document.getElementById('contentBlock');
    if (contentBlock != null)
    {
    	if (document.getElementById('menuBlock').clientHeight >= document.documentElement.clientHeight && document.getElementById('contentBlock').clientHeight <= document.documentElement.clientHeight)
        {
    		contentBlock.style.height = document.getElementById('container').offsetHeight+document.getElementById('footerContainer').offsetHeight + 'px';
        }
		/*
    	if (navigator.appName == "Opera")
        {
            contentBlock.style.height = '100%';
        }
		*/
    }
}