function getScrollPosition(flagDiv)
	{
		var divFlag = flagDiv;
	    var tab = Array((document.documentElement && document.documentElement.scrollLeft) || window.pageXOffset || self.pageXOffset || document.body.scrollLeft,(document.documentElement && document.documentElement.scrollTop) || window.pageYOffset || self.pageYOffset || document.body.scrollTop);
		var position_page = tab[1];
		var ht_page = document.body.clientHeight;
		var ht_div_centre = (ht_page/3) + position_page;

		document.getElementById(divFlag).style.top = ht_div_centre;			
		/*alert(ht_div_centre + '-' + ht_page + '--' + position_page);*/
}