var HtmlWindow =
{
	open: function(element_id, show_blocker) {
		if (show_blocker) {
			Html.showBlocker();
		}
		elem = document.getElementById(element_id);
		elem.style.display = 'block';
		
		width = elem.offsetWidth;
		height = elem.offsetHeight;
		windowsize = Html.getWindowsize();
		xpos = (windowsize[0] / 2) - (width / 2);
		ypos = (windowsize[1] / 2) - (height / 2) - 20 + document.documentElement.scrollTop;
		
		elem.style.top = ypos + 'px';
		elem.style.left = xpos + 'px';
		
	},

	close: function(element_id) {
		if (elem = document.getElementById(element_id)) {
			elem.style.display = 'none';
		}
		Html.hideBlocker();
	}
}