window.onscroll = function()

{

	if( window.XMLHttpRequest ) {

		if (document.documentElement.scrollTop > 0 || self.pageYOffset > 0) {

			$('content').style.position = 'fixed';

			$('content').style.top = '0';

		} else if (document.documentElement.scrollTop < 0 || self.pageYOffset < 0) {

			$('content').style.position = 'absolute';

			$('content').style.top = '0px';

		}

	}

}
