//È¡ä¯ÀÀÆ÷¿í¡¢¸ßµÈ
function getDirect ()
{
	var ob = {};
	
	ob.width = document.offsetWidth || document.documentElement.clientWidth || document.body.clientWidth;
	ob.height = document.offsetHeight || document.documentElement.clientHeight || document.body.clientHeight;
	
	ob.scroll_left = window.scrollX || document.documentElement.scrollLeft;
	ob.scroll_top = window.scrollY || document.documentElement.scrollTop;
	
	return ob;
}



function popup_comment (em,e)
{
	    var box = document.getElementById(em);

		var direct = getDirect();
		box.style.top = (direct.height - box.offsetHeight) / 2 + direct.scroll_top + 'px';
		box.style.left = (direct.width - box.offsetWidth) / 2 + (direct.scroll_left-180) + 'px';
		box.style.display = "block";

}